Water — Track 1: Level 6 Conserve
Conservation isn't about suffering through an emergency — it's about extending your options. Every gallon you don't use today is a gallon available tomorrow. This page covers where water actually goes, how to reduce it in daily life, and the emergency conservation habits that change the math when it matters.
The household budget
You can't reduce what you haven't measured. The average American uses 80–100 gallons of water per person per day — most of it in ways people don't track.[1]
Household water use by category
Source: EPA WaterSense. Indoor residential use only. Outdoor irrigation adds significantly in summer months.
The conservation opportunity
Two things stand out from this distribution. First, toilet flushing — the single largest category — uses zero water for personal hydration or hygiene. Every gallon used to flush is a gallon that produces nothing except waste conveyance. Second, leaks account for 12–13% of household water use on average — water that leaves without providing any benefit.
Fix leaks first. They're passive savings — fix once, save every day. Then address toilet and shower efficiency. Then behavioral changes in cooking and cleaning. This order of operations gets the most water saved for the least daily effort.
The emergency comparison
Average daily use per person: 80–100 gallons. Minimum daily need for drinking and cooking: 1.5 gallons. Comfortable emergency use including basic hygiene: 2–3 gallons. The gap between normal use and emergency minimum is a 97% reduction — achievable for short durations with the right habits and supplies.
Everyday conservation
The most effective conservation changes are structural — things you do once that reduce water use automatically. Behavioral changes require daily discipline; structural changes work whether you're thinking about it or not.
~10 gallons/day saved, zero ongoing effort
A dripping faucet at one drip per second wastes roughly 3,000 gallons per year. A running toilet can waste 200 gallons per day. The average home leaks 10 gallons per day — 3,650 gallons per year — without the homeowner noticing.
The dye test: Add food coloring to the toilet tank. Wait 15 minutes without flushing. If color appears in the bowl, the flapper is leaking. A replacement flapper costs $5–10 and takes 15 minutes to install. This is the single highest-return water fix in most homes.
Meter check: Record your water meter, use no water for 2 hours, check again. Any change is an active leak. Most hidden leaks are at toilet flappers, faucet washers, irrigation valves, and hose bib connections.
40–50% reduction in shower/faucet use
A standard showerhead flows at 2.5 gallons per minute. An EPA WaterSense certified showerhead flows at 1.8 gpm — a 28% reduction. A 10-minute shower saves 7 gallons per shower, per person. At two people, that's 5,110 gallons per year from replacing two showerheads.
Faucet aerators reduce kitchen and bathroom faucet flow from 2.2 gpm to 0.5–1.5 gpm depending on the type. Screw directly onto the faucet head — cost is under $5 per aerator.
WaterSense-certified toilets use 1.28 gallons per flush vs. the older standard 3.5–6 gallons per flush. If replacing a toilet, WaterSense certification saves 4,000+ gallons per toilet per year.
Low effort, meaningful daily savings
Turn off the tap while brushing teeth: 4 minutes of running water at 2 gpm = 8 gallons per person per day for no reason. Wet the brush, turn off the tap, brush, rinse briefly.
Full-load laundry: A front-loader uses 15–25 gallons per load regardless of load size. Only run full loads.
Cold water start: Letting the hot water "warm up" wastes 1–5 gallons per use. Keep a pitcher at the sink to capture this water for plants or cooking.
Shorter showers: A shower timer or a 4-minute playlist as a ceiling. Every minute cut saves 2.5 gallons.
Emergency mode
Emergency conservation isn't about comfort — it's about making a finite supply last as long as possible. These are the changes that take a 14-day supply and stretch it to 3 weeks or more.
Paper plates and disposable utensils
Eliminates dishwashing entirely. The water cost of disposables is offset by the water saved. Use for a short-duration emergency without guilt.
Hand sanitizer for non-critical handwashing
Use when hands aren't visibly dirty. Soap and water is still required after using the toilet, handling raw food, and treating wounds — no substitute there. Hand sanitizer covers everything else.
Stop laundry, dishwasher, outdoor watering
All three eliminated immediately. Clothes and dishes that are merely dirty can wait. Laundry can resume when water is restored.
Toilet flushing with grey water or bathtub water
Reserve stored drinking water for consumption. Use bathtub water (WaterBOB), dishwater, or other grey water for toilet flushing. See Sanitation Without Water for bucket-flush technique.
Drinking water
Minimum — increase in heat or physical activity
Cooking and food preparation
Boiling, rehydrating, basic prep
Sponge bath (full body)
Focus: face, underarms, groin, hands, feet
Teeth brushing, hand washing
Twice daily brushing, critical handwashes
Dishwashing (if needed)
Three-basin method, or paper plates = 0
Daily total per person
Functional, dignified emergency minimum
At 1.75 gal/person/day, 42 gallons (a 14-day supply at the standard 1.5 gal/day calculation) covers 24 days. Children have lower minimums; pets and infants have specific needs.
Dishwashing under constraint
Restaurant kitchens use this method for regulatory compliance. It works for home use with minimal water:
Scrape first. Remove food residue with a rubber spatula or paper towel before any water contact. This dramatically reduces how dirty the wash water gets.
Basin 1 — Wash. Hot soapy water, about 1 gallon. Wash all items.
Basin 2 — Rinse. Clean warm water, about 0.75 gallon. Rinse soap off all items.
Basin 3 — Sanitize. 1 tablespoon of unscented bleach per gallon of water, about 0.75 gallon. Dip or rinse. Air dry — do not towel dry.
Total water use: ~2.5 gallons for a full load. A standard dishwasher uses 3–6 gallons per load; hand washing under a running tap uses 8–27 gallons.
Sponge bathing technique
A sponge bath done correctly maintains adequate hygiene with less water than a single toilet flush. The focus is the areas that produce the most odor and hygiene risk:
Dry shampoo: Hair can go 3–5 days without washing for most people when dry shampoo is used. Keeps hair clean-feeling without any water. This is a legitimate and effective conservation measure, not a compromise.
Emergency laundry
Most clothing can go longer between washes than people typically allow. In a water emergency, the prioritization is:
Underwear and socks — wash daily if possible; use a small basin with 0.5 gallon hand-wash method
Work clothes with soil, food contact, or bodily fluid exposure — infection control priority
Outer layers worn briefly without soiling — hang to air out, rewear multiple times
Hand-washing with 0.5 gallon and wringing thoroughly uses far less water than any machine. Hang to dry — no dryer energy needed and the UV of sunlight provides some additional sanitizing.
Garden conservation
In a water restriction or disruption, food-producing plants take priority over ornamentals. Established trees and shrubs have deep roots and can weather several weeks without supplemental water in most climates.
Connected guides
Calculate your household's actual target storage volume — accounting for people, pets, climate, and the cooking and sanitation water most calculators miss.
Run the calculation →
Toilet flushing with a bucket, grey water for sanitation, and when the drain itself isn't working. The problem most households don't plan for.
Sanitation guide →
No-rinse products, sponge bathing, dental hygiene, and how to maintain clean hands when water is severely rationed.
Hygiene guide →