Tag: leak prevention

Emergency Plumbing in Caldwell, ID: What to Do First (and How to Prevent the Next One)

June 26, 2026

A calm, fast checklist for leaks, clogs, and “something’s wrong” moments

Plumbing emergencies rarely start as a dramatic flood. In most Caldwell homes, it begins with a slow drain, a faint gurgle, a warm spot on the floor, or a water heater that “seems fine” until it isn’t. This guide is built for real-life urgency: what to do in the first 5–15 minutes, how to protect your home and family, and which small prevention habits reduce the odds you’ll need an emergency plumber again.

First: define “emergency” (so you don’t lose time)

Use this quick rule: it’s an emergency if water is actively damaging your home, sewage is backing up, you smell gas, or you’ve lost essential service (no water, no hot water for a household that needs it, or a toilet overflow you can’t stop). If you’re unsure, treat it like an emergency until proven otherwise—water damage spreads fast, and sewage exposure is a health concern.
Call 911 first if you suspect a gas leak (rotten-egg smell) or anyone is in immediate danger. For suspected gas leaks: leave the building and avoid flipping switches or using phones inside the home.

The 5–15 minute emergency plumbing checklist (Caldwell homes)

1) Stop the water: shut off the right valve

For a single fixture leak (toilet, sink, dishwasher): shut off the local stop valve (usually under the sink or behind the toilet).
For a burst pipe or unknown leak: shut off your home’s main water valve (often in a basement/utility area, crawlspace entry, or near where the line enters the home). Turn it clockwise until it stops.

2) Protect your electrical safety

If water is near outlets, a panel, or appliances, keep people away. If it’s safe to do so, shut off power to the affected area at the breaker. Don’t step into standing water if you’re unsure about electricity.

3) If it’s a sewer backup: stop using water immediately

When a main line is blocked, every flush, shower, or laundry cycle can push more wastewater into the lowest drain (often a basement floor drain, shower, or first-floor tub). Sewer overflows are commonly triggered by clogs from inappropriate materials (fats/oils/grease and wipes—even some labeled “flushable”). The EPA specifically calls out FOG and wipes as frequent contributors to sanitary sewer overflow problems. (epa.gov)

4) If the water heater is leaking: turn off power/fuel, then water

Electric water heater: turn off the breaker first.
Gas water heater: set the gas control to “Off” (if you smell gas, leave and follow emergency guidance).
Then shut off the cold-water supply valve to the tank. If the leak is significant, avoid running hot water; it can accelerate damage and keep feeding the leak.

5) Document and mitigate (quickly)

Take a few photos/videos for your records. Move towels, bins, or a wet/dry vac into action if safe. If the main is off, open a few faucets to relieve pressure and drain what remains in the lines.

Common emergency triggers in the Treasure Valley (and what they look like)

1) FOG + “flushable” products → main line clogs
Kitchen grease is a big one: it cools, sticks, and traps debris. Wipes and hygiene products don’t break down like toilet paper and can snag on imperfect pipe joints. The EPA specifically highlights FOG and some “flushable” products as inappropriate materials in sewers. (epa.gov)

2) Tree root intrusion → recurring slow drains and backups
Roots seek moisture and can enter through tiny cracks or joints—especially in older clay or concrete lines—then form a net that catches debris and causes backups. (erieinsurance.com)

3) Winter cold snaps → frozen pipes and sudden leaks after thaw
When water freezes, it expands and can crack piping; you may not see the damage until things warm up and water starts flowing again. (almanac.com)

4) Aging water heaters → leaks, sediment issues, and no-hot-water mornings
Small leaks around the base, rusty water, or popping sounds can signal internal tank problems or heavy sediment. Routine flushing (when appropriate for your unit) can reduce problems and is recommended by many manufacturers. (cdc.gov)

Practical prevention steps (that don’t feel like “homework”)

A) Make your drains harder to clog

Keep grease out of the plumbing system: wipe pans with a paper towel and dispose of cooled grease in the trash. If you’re on a septic system, the EPA also advises against pouring cooking grease/oil down the drain and recommends avoiding chemical drain openers. (epa.gov)

Fast habit: Put a small “grease jar” under the sink (a metal can works well). When it’s full, toss it.

B) Get ahead of root problems (before the holiday backup)

If your property has mature trees or you’ve had repeating slow drains, consider proactive drain cleaning and periodic inspections. Root intrusion can reoccur if the underlying pipe joints are compromised, so a “clear it once” approach may not be enough in the long run. (erieinsurance.com)

C) Winterize the weak spots in Caldwell homes

In Idaho winters, plumbing in garages, crawlspaces, exterior walls, and under-sink cabinets is especially vulnerable. Basic steps—insulating exposed piping, sealing cold air leaks, and maintaining a safe indoor temperature—can prevent freeze damage. Frozen pipe issues are often preventable with straightforward cold-weather habits. (almanac.com)

If you suspect a frozen pipe: a faucet that trickles or won’t run can be an early sign. Keep the faucet slightly open while thawing and call a plumber if you can’t locate the freeze point or suspect a burst. (goodhousekeeping.com)

D) Set water heater expectations (temperature + maintenance)

Many households aim for safer tap temperatures to reduce scald risk, while also balancing bacterial growth prevention. The CDC notes that higher heater settings can reduce germs like Legionella but increase burn risk—and recommends using mixing/thermostatic valves if temperatures are set above 120°F. (cdc.gov)

E) Don’t ignore “small leaks” (they’re rarely small for long)

A pinhole leak, a damp cabinet base, or a ceiling stain often means active water movement. Catching it early can prevent drywall, flooring, and cabinet damage. If you’ve had recurring leaks or suspect aging lines, a proactive repair plan can be more comfortable than repeating emergencies.

Did you know? Quick facts that help you avoid a midnight call

“Flushable” doesn’t always mean sewer-safe. The EPA notes that some products marketed as flushable can contribute to sewer overflows. (epa.gov)
Frozen pipes often fail when they thaw. Ice expansion can crack tubing; the leak may appear later when water pressure returns. (almanac.com)
Water heater temperature is a safety decision. The CDC highlights the burn-risk tradeoff and suggests thermostatic mixing valves if set above 120°F. (cdc.gov)

Quick comparison: common problems and the safest first move

Problem
What you’ll notice
Safest first move
Burst/active leak
Water pooling, rushing sound, ceiling drip
Shut off main water, avoid electricity near water, call a plumber
Sewer backup
Gurgling drains, lowest drain overflowing, sewage smell
Stop all water use, keep kids/pets away, call for drain clearing
Water heater leak
Water around tank base, no hot water
Turn off power/fuel, shut off cold supply to tank, call for service
Frozen pipe
Trickle/no flow, cold area of wall, frost on pipe
Open faucet slightly, warm area safely; if unsure, call a plumber (goodhousekeeping.com)

Local angle: Caldwell-specific peace of mind

Caldwell’s mix of older neighborhoods and new development means plumbing problems can vary widely—everything from aging sewer laterals that invite root intrusion, to newer homes where a single clog still cascades into a backup if the main line is compromised. The smart move for Treasure Valley homeowners is to treat “odd but minor” symptoms as early warnings: recurring slow drains, periodic sewer odors, or a water heater that takes longer to recover.

Cloverdale Plumbing is family-owned and has served the Treasure Valley since 1953, with 24/7 emergency response—meaning you can speak directly with a plumber when timing matters.

Need emergency plumbing help in Caldwell?

If you’re dealing with active leaking, a suspected sewer backup, a failed water heater, or frozen pipes, getting the right help quickly can prevent a small problem from turning into major repairs.

FAQ: Emergency plumbing in Caldwell, Idaho

What should I do first if a pipe bursts?

Shut off the main water valve, keep water away from electrical hazards, and call a plumber. Open a few faucets after the main is off to reduce pressure and drain remaining water.

How can I tell if it’s a sewer backup or just a single clogged drain?

If multiple fixtures are slow (or the lowest drain is backing up), it may be a main line issue. If only one sink or one tub is affected, it’s more likely a localized clog.

Are “flushable” wipes okay to flush?

Many systems still struggle with wipes and similar products. The EPA notes that some products marketed as “flushable” can contribute to sanitary sewer overflows. (epa.gov)

Should I use chemical drain cleaners during an emergency?

It’s often safer to avoid them—especially if you may need professional drain work. For septic systems, the EPA specifically advises avoiding chemical drain openers for clogs. (epa.gov)

What’s a safe water heater temperature for families with kids?

Many homes target 120°F to reduce scald risk, but temperature choices can involve other considerations. The CDC notes the safety tradeoff and recommends thermostatic mixing valves if set above 120°F. (cdc.gov)

Glossary (plain-English plumbing terms)

FOG: Fats, oils, and grease. When poured down drains, they cool and cling to pipes, contributing to clogs and backups.
Main shutoff valve: The valve that stops water to the entire home (different from the small shutoffs under sinks/toilets).
Sewer lateral: The pipe that carries wastewater from your home to the public sewer main (or to a septic system).
Hot water jetting (hydro jetting): A professional method that uses high-pressure water to scour buildup (grease, scale, roots) from drain and sewer lines.
Thermostatic mixing valve: A valve that blends hot and cold water to deliver a safer temperature at the tap—useful when the water heater is set higher than 120°F. (cdc.gov)

Plumbing Remodels in Eagle, Idaho: A Homeowner’s Guide to Avoiding Leaks, Low Pressure, and Costly Rework

June 1, 2026

Plan your remodel around the plumbing—not around surprises behind the wall

A kitchen or bathroom remodel in Eagle can look perfect on day one and still create problems later—slow drains, sewer odors, noisy pipes, or a shower that never gets hot for long. Most of those issues come from plumbing decisions made early (or not made at all). This guide breaks down what to consider before you pick tile and fixtures, how to protect your investment, and when it’s smart to bring in a licensed plumber.

Why plumbing planning matters in a remodel

In a remodel, the plumbing is the system that’s hardest (and most expensive) to fix after finishes go in. A minor drain slope mistake can lead to recurring clogs. An undersized supply line can cause low flow at the shower when someone starts the dishwasher. And an outdated shutoff valve can turn a small future repair into an emergency.

A solid plumbing plan accounts for water delivery (pressure/volume), drainage (venting and slope), appliance demands, and long-term service access. Done right, it also reduces the risk of mold and water damage—especially important in busy family homes where a leak can go unnoticed for hours.

Common plumbing “gotchas” in kitchen and bath remodels

1) Moving fixtures farther than your drain/vent can support

Homeowners often want to relocate a sink, toilet, or shower for a better layout. That’s absolutely doable—but drains and vents have limits. If a fixture is moved without proper venting or correct drain slope, you can get gurgling, slow drainage, or sewer smells. The fix usually involves opening walls or floors again—exactly what you’re trying to avoid.

2) Choosing “statement” fixtures that require specific rough-in dimensions

Wall-mount faucets, freestanding tubs, and large rain showers can need different valve locations, blocking, and pipe sizing than standard fixtures. Confirm rough-in requirements before framing and tile work. It’s one of the simplest ways to prevent last-minute change orders.

3) Underestimating drain performance (especially with modern kitchens)

Deep kitchen sinks, garbage disposals, and “everything rinse” habits can overwhelm older drain lines—especially if grease has narrowed the pipe over the years. Proactively cleaning the line before the new cabinet and sink install can prevent a brand-new kitchen from getting hit with backups.

4) Skipping shutoff upgrades and access panels

A remodel is the best time to add quality shutoffs and make them reachable. If a faucet cartridge fails two years from now, you’ll want a fast shutoff—without pulling drawers or cutting drywall.

5) Water heater capacity surprises after adding a bigger shower

If your remodel adds a second shower head, body sprays, a larger soaking tub, or a new laundry setup, your hot water demand may jump. That can expose a marginal water heater (or an aging unit) quickly.

Step-by-step: How to plan plumbing for a remodel (without overbuilding)

Step 1: Map your “must keep” zones

Identify what you want to keep in place (like a toilet location over a slab or a kitchen sink under an existing window). Keeping major drains close to their current location can reduce cost and complexity.

Step 2: Check supply and drain line condition before you close anything in

If you’re opening walls, it’s worth evaluating supply lines, drain lines, and valves while access is easy. Replacing a questionable section now can be far cheaper than repairing water damage later.

Step 3: Size the system for real life (kids, guests, simultaneous use)

Many homes experience pressure complaints when multiple fixtures run at the same time. A plumbing plan should consider peak usage: morning showers, dishwashing, laundry, and irrigation overlap.

Step 4: Build a drain-cleaning and maintenance strategy into the remodel

Remodel time is a smart time to address recurring clogs. For heavily used lines—especially kitchen and main line concerns—professional cleaning can restore flow and reduce backups. For some situations, hot water jetting (also called hydro jetting) can remove grease, scale, and buildup more thoroughly than a basic snake.

Step 5: Choose water-saving fixtures that still feel comfortable

Many homeowners want a “spa shower” feel without wasting water. WaterSense-labeled showerheads are designed to use no more than 2.0 gallons per minute and are tested for performance across typical household pressures. (epa.gov)

Step 6: Confirm expansion control for water heaters in closed systems

If your home has a pressure-reducing valve (PRV) or backflow device, it may function as a “closed system,” which can require thermal expansion control (often an expansion tank). Plumbing codes commonly require expansion control where a closed system exists. (nationalwaterheaterauthority.com)

Quick comparison: Remodel upgrades that prevent the most future headaches

Upgrade Best for Why it matters When to do it
New quarter-turn shutoff valves All kitchens/baths Faster isolation during leaks; easier future repairs During rough-in, before cabinets/vanities
Drain cleaning or hot water jetting Homes with slow drains/backups Restores drain capacity; reduces clog risk after new fixtures Before fixtures and finishes go in
Water heater right-sizing New showers/tubs/appliances Prevents “runs out of hot water” complaints Before final fixture selection
Water treatment / softening system Scale/spotting concerns Helps protect fixtures, water heaters, and improves soap performance Any time; easiest during plumbing access

Local angle: What Eagle, Idaho homeowners should keep in mind

Eagle homes range from older properties with legacy plumbing materials to newer builds with modern manifolds and high-efficiency fixtures. Either way, remodel success tends to come down to two things: (1) keeping drains reliable and (2) keeping hot water consistent when the home is busy.

If your home has hard water concerns (scale on faucets, cloudy glassware, stiff laundry), it can accelerate buildup in fixtures and water-heating equipment. In those cases, pairing a remodel with a water treatment plan can protect your new finishes and help appliances run more efficiently over time.

If you’re adding a tankless water heater during a remodel, plan for maintenance access. Many manufacturers and maintenance guides recommend periodic descaling/flushes (often annually, depending on water conditions and usage), which typically involves circulating vinegar or a descaling solution through the unit. (ahs.com)

Need a plumber for your remodel in Eagle?

Cloverdale Plumbing has been serving the Treasure Valley for decades, helping homeowners plan clean rough-ins, reliable drains, and fixture installs that work the way they should—day after day. If you’re remodeling a bathroom, kitchen, or addition, it’s worth getting the plumbing scoped early so you can lock in the layout with confidence.

Emergency help available: 24/7 emergency plumbing services

FAQ: Plumbing remodels in Eagle, ID

Can I move a toilet or shower to a different wall?

Often, yes—but it depends on where the drain can run, how the venting will be handled, and what’s below the floor (crawlspace, slab, finished space). A plumber can confirm feasibility and help prevent slow drains or sewer odors.

Is hot water jetting safe for my pipes?

In many cases, yes—when performed by a professional who evaluates the line condition first and uses appropriate pressure and technique. It’s commonly used to remove grease, scale, and buildup more thoroughly than basic snaking.

Should I replace shutoff valves during a remodel?

If valves are old, corroded, or hard to turn, a remodel is the ideal time to replace them. New quarter-turn shutoffs improve reliability and make future repairs faster and cleaner.

Do I need an expansion tank when replacing a water heater?

If your home’s water system is “closed” (often due to a PRV or backflow prevention), thermal expansion control may be required and can protect the plumbing system from pressure spikes. Codes commonly address this requirement for closed systems. (nationalwaterheaterauthority.com)

How often should a tankless water heater be flushed?

Many guidance sources recommend periodic descaling/flushes (often annually), but the best schedule depends on your water quality and usage. If your home has mineral buildup issues, more frequent service may help maintain performance. (ahs.com)

Glossary

Thermal expansion
When water heats up, it expands. In a closed plumbing system, that expansion can increase pressure and stress valves, fixtures, and the water heater.
Expansion tank
A small tank installed on the cold-water line that helps absorb pressure increases caused by thermal expansion in closed systems.
Hot water jetting (hydro jetting)
A professional drain-cleaning method that uses high-pressure water (often heated) to remove grease, scale, roots, and buildup from drain and sewer lines.
WaterSense
An EPA program that labels water-efficient products designed to save water while maintaining performance; WaterSense-labeled showerheads use no more than 2.0 gpm. (epa.gov)

Plumbing Remodels in Caldwell, ID: A Homeowner’s Guide to Avoiding Leaks, Low Pressure, and Costly Re-Work

May 26, 2026

A remodel should make life easier—not create plumbing surprises behind fresh tile and new cabinets

If you’re planning a kitchen or bathroom update in Caldwell, plumbing decisions made early (and done correctly) can prevent the most common post-remodel headaches: slow drains, water pressure that never feels “right,” mystery odors, noisy pipes, and leaks that show up weeks after the final walkthrough. This guide breaks down what homeowners should think about before walls close up—so your remodel looks great and performs even better.
Why “plumbing remodels” are different from basic plumbing repairs
A repair is often about restoring function fast (stop the leak, clear the clog, replace the failed part). A remodel is about design + performance + future access. That means your plumber is coordinating with your designer/contractor, confirming fixture specs, verifying drain and vent layouts, and making sure what’s inside the wall will stay reliable long after the remodel dust settles.
The 7 plumbing decisions that matter most during a remodel
1) Fixture selection (before rough-in)
That “simple” faucet upgrade can require different valve types, supply sizes, or mounting requirements. Showers are even more sensitive—many popular systems need specific rough-in valves, trim compatibility, and correct depth in the wall. Buying fixtures early (or at least confirming exact models) helps your plumber rough-in once—correctly.
2) Drain size and slope (what you can’t “eyeball”)
Drains need the right diameter and pitch to move waste without leaving buildup behind. Too flat can cause standing water and odors; too steep can let water outrun solids. This is one of the top reasons homeowners experience “brand-new but always slow” drains after a remodel.
3) Venting (the hidden system that keeps drains quiet and fast)
Proper venting protects trap seals and helps drains empty efficiently. If a remodel changes fixture locations—especially moving a kitchen sink, adding a second vanity, or relocating a laundry—venting must be reviewed. Symptoms of poor venting include gurgling sounds, sewer odor, and frequent clogs.
4) Water pressure and shutoff strategy (future you will thank you)
Remodel time is the best time to add or upgrade shutoff valves that actually work—and place them where you can reach them. If something ever fails, you’ll want to isolate a bathroom or fixture quickly, not shut down the entire home.
5) Pipe material transitions and aging lines
Many Caldwell-area homes span multiple eras of plumbing. During a remodel, it’s common to uncover older supply or drain piping that’s near end-of-life. Carefully planned pipe repair/replacement (instead of piecemeal patching) reduces the chance of “the next leak” appearing right after you invest in new finishes.
6) Water heater capacity (and thermal expansion protection)
Adding a larger tub, a rain shower, or an extra bathroom can stretch an older water heater. Remodel planning is a good moment to confirm capacity and recovery time. Also, many systems are “closed” (meaning pressure can’t easily relieve back into the city main), so thermal expansion control may be needed to protect the water heater, valves, and fixtures. Boise-area installation guidance notes that an expansion tank is required when a closed system is present. (cityofboise.org)
7) Drain cleaning access (cleanouts) and preventative maintenance
Remodels can accidentally bury access points behind cabinetry or finished walls. Keeping (or adding) cleanouts in smart locations makes future maintenance faster and less invasive. For problem lines, hot water jetting can remove grease, scale, and buildup more thoroughly than “snaking” alone.
Helpful pages for Caldwell-area homeowners
If you’re scoping a remodel and want to understand service options, these may help:

Optional planning table: what to confirm before rough-in vs. before final install
Item Confirm Before Rough-In Confirm Before Final
Shower system Valve model, depth, layout Trim fit, flow, temperature balance
Kitchen sink/disposal Drain location, venting approach No leaks, proper trap, fast drainage
Toilet placement Flange location, clearances Secure set, stable base, proper fill/flush
Shutoff valves Add/relocate for accessibility Labeling and function check
Water heater impact Capacity, venting/gas/electric needs Stable temps, no T&P discharge, expansion control (if needed)
Tip: If you’re ordering fixtures online, keep model numbers and spec sheets in one shared folder so your plumber and contractor can verify compatibility before anything is installed.
Step-by-step: a remodel-friendly plumbing plan (simple, but thorough)

Step 1: Walk the space and list “wish list” water uses

Think beyond aesthetics: pot filler, extra shower head, larger tub, laundry relocation, water filtration/softening, hose bib upgrades, or a utility sink. Each adds demand and sometimes changes drain/vent planning.

Step 2: Confirm fixture specs early

Share model numbers for faucets, shower trims, tubs, toilets, and sinks. This helps avoid “trim doesn’t fit the valve” scenarios and prevents rough-in revisions.

Step 3: Address old piping while walls are open

If any sections show corrosion, repeated patch history, or questionable prior DIY work, consider proactive pipe repair or replacement in those accessible zones. It’s almost always less expensive than opening finished walls later.

Step 4: Plan for service access

Ask where shutoffs will be, where cleanouts are located, and whether any access panels are recommended (for tubs, valves, or specialty features). A clean final look can still be service-friendly with smart placement.

Step 5: Test before finishes

Before tile, paint, and cabinets are finalized, confirm the rough-in is pressure-tested (where applicable), drains run freely, and fixtures operate correctly. Catching issues at this stage prevents the most expensive kind of re-work.
Local angle: what Caldwell homeowners should keep in mind
Caldwell and the Treasure Valley include a mix of older neighborhoods and newer developments—meaning remodel projects range from “simple refresh” to uncovering legacy plumbing that needs modernization. If you’re changing fixture locations or altering supply/drain lines, it’s also smart to ask early about permit expectations and inspection timing so your construction schedule stays smooth.
Water quality can also influence remodel choices. Some sources report Caldwell water hardness around 150 ppm (moderately hard), which can contribute to mineral buildup over time in fixtures and certain appliances. Many homeowners choose to factor in water treatment (like softening) during a remodel since access is easier and the results show up quickly in day-to-day use. (waterhardness.org)
Considering water treatment?
If you’re already updating sinks, plumbing lines, or adding a utility area, it may be a convenient time to plan for filtration or softening. Learn more here: Water softening systems.
Ready to plan a plumbing remodel in Caldwell?
Cloverdale Plumbing has served the Treasure Valley since 1953. If you want clear communication, experienced workmanship, and a remodel plan that prioritizes reliability behind the walls, we’re here to help.
FAQ: Plumbing remodels in Caldwell, Idaho
Do I need a plumber if I’m just replacing fixtures?
If you’re swapping “like for like” and the shutoffs, supplies, and drains are in good condition, it can be straightforward. But if you’re changing sink depth, adding a disposal, moving a shower valve, or updating old shutoffs, a plumber helps prevent leaks and compatibility issues.
Why do remodel drains sometimes clog more often?
Common causes include improper venting, incorrect slope, undersized piping for the new fixture load, or debris left in the line during construction. A professional check during rough-in is the best prevention.
What is hot water jetting, and when is it worth it?
Hot water jetting uses high-pressure hot water to scour buildup like grease, sludge, and some root intrusion from the inside of pipes. It’s often used for recurring kitchen or mainline issues, and it can be a strong preventative step before you invest in new finishes.
How do I know if my home is a “closed system” that needs thermal expansion control?
Many homes have devices like pressure-reducing valves or backflow prevention that keep water from pushing back toward the public supply. When water heats and expands in a closed system, pressure can rise and stress fixtures and the water heater. Boise’s published installation guidance notes an expansion tank is required when a closed system is present. (cityofboise.org)
Is there a safe level of lead in drinking water?
EPA information explains that systems compare results to an action level historically listed as 0.015 mg/L (15 ppb) for lead, and that exceeding it triggers required actions for public water systems. If you have concerns—especially with older plumbing—ask about testing and filtration options. (epa.gov)
Glossary (helpful remodel plumbing terms)
Rough-in
The stage where supply lines, drains, vents, and valves are installed before drywall, tile, and cabinets go in.
Trap (P-trap)
The curved section under a sink that holds water to block sewer gases from entering the home.
Venting
A system of pipes that balances air pressure in drain lines so fixtures drain properly and traps keep their seal.
Closed plumbing system
A water supply setup where expanding heated water can’t easily push back into the municipal supply (often due to valves/devices that prevent backflow).
Thermal expansion tank
A small tank installed on the cold water side near a water heater to absorb pressure increases as water heats and expands—especially important in closed systems. (cityofboise.org)