Water Bill Estimator
Estimate your monthly water bill and compare to state and national averages. Find conservation tips to reduce costs.
- Monthly bill estimate using data from 104+ major utilities and state-level EIA rates
- Side-by-side comparison to state and national averages
- Personalized conservation tips based on your usage profile
How This Estimator Works
- Enter your ZIP code — we load your local water system data and regional rate information.
- Specify household size — the USGS estimates 80-100 gallons per person per day for domestic use.
- Select usage level — outdoor irrigation and pools can double water consumption.
- Get your estimate — monthly bill projection with comparison to state and national averages.
What Drives Water Costs?
Water bills vary dramatically across the US. The primary factors are:
- Water scarcity — Western states and drought-prone areas charge 2-3x more per gallon.
- Infrastructure age — Older systems require more maintenance, passed to ratepayers.
- Water source — Groundwater treatment is typically cheaper than surface water treatment.
- Sewer charges — Often based on water usage and can equal or exceed the water charge itself.
Concerned about your water quality?
Find the Right Water FilterOur water filter tool recommends filters based on contaminants detected in your ZIP code.
Water Costs by State
The national average household water bill is approximately $70–$75 per month for water and sewer combined, based on EPA and USGS usage estimates of 80–100 gallons per person per day. However, costs range from under $30 to over $100 depending on location. Four factors drive most of the variation: water scarcity (arid regions charge 2–3x more), infrastructure age (older pipe systems pass maintenance costs to ratepayers), water source (groundwater treatment is cheaper than surface water), and local regulations.
Water rates have been increasing 3–5% annually nationwide over the past decade, outpacing general inflation. The American Water Works Association projects continued increases as utilities invest in aging infrastructure replacement and compliance with new EPA contaminant standards. Sewer charges — calculated at 80–100% of your water volume — often double the water-only portion of your bill.
| Rank | State | Avg. Monthly Cost | Trend |
|---|---|---|---|
| Most Expensive | |||
| 1 | West Virginia | $91 | ↑ 4.8%/yr |
| 2 | California | $86 | ↑ 5.2%/yr |
| 3 | Oregon | $84 | ↑ 4.1%/yr |
| 4 | Washington | $82 | ↑ 3.7%/yr |
| 5 | New Jersey | $79 | ↑ 3.9%/yr |
| Least Expensive | |||
| 46 | Kentucky | $38 | ↑ 2.1%/yr |
| 47 | Idaho | $36 | ↑ 2.5%/yr |
| 48 | Vermont | $34 | ↑ 1.8%/yr |
| 49 | Wisconsin | $32 | ↑ 2.3%/yr |
| 50 | North Dakota | $29 | ↑ 1.6%/yr |
Sources: AWWA/Raftelis Water and Wastewater Rate Survey, Circle of Blue water pricing reports, EPA SDWIS. Averages reflect combined water and sewer for a household using 100 gallons/person/day.
Frequently Asked Questions
What is the average water bill in the US?
The average U.S. household pays approximately $70 to $80 per month for water and sewer combined, based on usage of about 80 to 100 gallons per person per day (USGS estimates). However, bills vary widely by region — desert cities like Phoenix or Las Vegas often charge more due to water scarcity, while areas with abundant freshwater tend to be cheaper.
Why is my water bill so high?
The most common causes of unexpectedly high water bills are leaks, increased seasonal usage (lawn irrigation, pools), and rate increases by your utility. A single running toilet can waste up to 200 gallons per day. The EPA recommends checking your meter before and after a two-hour period of no water use — if the reading changes, you likely have a leak.
What is a sewer charge on my water bill?
Sewer charges cover the cost of treating wastewater after it leaves your home. Most utilities calculate sewer fees based on your water consumption, typically at 80% to 100% of your water usage volume. Sewer charges often equal or exceed the water supply charge itself, sometimes doubling your total bill.
How can I reduce my water bill?
The EPA's WaterSense program estimates that fixing leaks and installing efficient fixtures can save the average household about 20% on water bills — roughly 13,000 gallons per year. High-impact steps include replacing old toilets with WaterSense models (1.28 vs 3.5 gpf), using efficient showerheads, and watering lawns early in the morning to reduce evaporation.
Do water rates vary by state?
Yes, significantly. Water rates can differ by 3x to 5x across states and even between neighboring cities. According to utility rate surveys, West Virginia and California tend to have among the highest combined water and sewer rates, while states with abundant freshwater like Wisconsin and Kentucky often have lower rates. Local infrastructure age and source water treatment costs are the primary drivers.
Data Sources & Methodology
Data Sources
- EPA SDWIS — Water system identification, source type, and service population for 150,000+ public water systems
- EIA Electricity & Utility Data — State-level residential utility rate benchmarks
- AWWA/Raftelis Rate Surveys — Published water and sewer rate schedules for 104 major U.S. utilities
- Circle of Blue Water Pricing — Annual pricing surveys for 30 major U.S. cities
- USGS Water Use Data — Per-capita water use estimates by state and county
- U.S. Census ACS — Household size distributions by ZIP code
Methodology
Monthly usage is estimated from USGS per-capita consumption data scaled by household size. Water charges are calculated using tiered volumetric rates from local utility schedules when available, with state-level EIA averages as fallback. Sewer charges are estimated at 80-100% of water volume. Results are compared against state and national averages from aggregated utility survey data.