Is Asotin, WA Tap Water Safe to Drink?
Graded A+ with no contaminants above EPA limits. Here's everything we tested and how Asotin ranks. What to do next ↓
96.6/100
waterverge.com Asotin, WA — Water Quality Report
Asotin's drinking water received a grade of A+ (96.6 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 2,531 residents using groundwater.
Lead levels were measured at 0.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 7 violations on record, including 1 health-based violation. All violations have been resolved.
What to know about Asotin's water
Asotin ranks #2 out of 294 cities in Washington for water quality, placing it one of the best in the state.
Asotin relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, Asotin may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Asotin, WA water safe to drink?
Based on EPA testing data, Asotin's tap water is generally safe to drink. The water system earned a grade of A+ (96.6/100), meeting federal drinking water standards across key contaminant categories. The city's 1 water system serves approximately 2,531 residents using groundwater (wells).
Recent water quality updates for Asotin
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Asotin's water quality assessment. Grade: A+ (96.6/100).
Federal disaster declaration (FEMA DR-3227). Coastal Storm event — may have impacted local water infrastructure.
Contaminants: Coliform (TCR).
Contaminants: Consumer Confidence Rule.
Contaminants: Coliform (TCR).
Federal disaster declaration (FEMA DR-1100). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Asotin's water supply.
Well within EPA limits.
Violation history
Asotin's water system has 7 total violations on record, including 1 health-based violation. All violations have been resolved.
Flood & environmental risk
Asotin County has experienced 5 federally declared disasters since 1964. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Asotin Creek.
Where does Asotin's water come from?
Asotin's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 2,531 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Asotin Creek (river).
What Asotin residents can do
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Asotin's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Asotin
Industrial polluters nearby
Reported releases to surface water by facilities near Asotin, ranked by pounds discharged annually.
Total reported releases to surface water: 66,823 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
CLEARWATER PAPER CORP-PPD & CPD IDAHO LEWISTON, ID83501 | Methanol | 66,488 | 6.8 mi |
FEDERAL CARTRIDGE CO-CCI LEWISTON, ID83501 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 333 | 4.4 mi |
FEDERAL CARTRIDGE CO-SPEER LEWISTON, ID83501 | Lead | 3 | 5.2 mi |
GUY BENNETT LUMBER CO CLARKSTON, WA99403 | — | — | 4.7 mi |
FEDERAL CARTRIDGE CO-SOUTHPORT LEWISTON, ID83501 | — | — | 2.5 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D2 — severe droughtAsotin County is currently in D2 (severe drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Asotin County has experienced 5 federally declared disasters since 1964. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Asotin compares by contaminant
Explore where Asotin ranks among all Washington cities for specific contaminants.
Water source & infrastructure
Where Asotin's water comes from
Asotin's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by local government ownership and serves approximately 2,531 people through 1 water system.
Water bodies near Asotin
Asotin is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Asotin
| System Name | PWSID | Population | Source |
|---|---|---|---|
| ASOTIN WATER DEPT | WA5303250 | 2,531 | GW |
How Asotin compares
Full Washington rankings →Asotin's score of 96.6/100 is above the average of 53/100 among major Washington cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Washington rankings →About Asotin, WA
Wikipedia →Asotin is a city in and the county seat of Asotin County, Washington, United States. The population of the city was 1,204 at the 2020 census. It is part of the Lewiston, ID-WA Metropolitan Statistical Area.
Learn more about your water
Guides and resources related to Asotin's water quality findings.
Explore water quality across Asotin
Frequently asked questions
Is Asotin, WA tap water safe to drink?
Asotin's water quality earned a grade of A+ (96.6/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #2 out of 294 cities tested in Washington.
What contaminants are in Asotin's water?
Lead was measured at 0.0 ppb (90th percentile). 7 violations are on record.
How is Asotin's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Asotin?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Asotin's water come from?
Asotin's water is sourced from Groundwater. The city has 1 water system serving approximately 2,531 residents.
What health violations has Asotin's water system had?
Asotin has 1 health-based violation on record. The most recent violation was recorded in September 2000. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. All health violations have been resolved.
Is Asotin's groundwater at risk of contamination?
Asotin uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 7 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Asotin's water compare to other cities?
Asotin ranks #2 out of 294 cities in Washington (better than 99% of state cities) and #172 out of 15744 cities nationally (99th percentile). The grade of A+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Asotin's small water system affect quality?
Asotin's system serves approximately 2,531 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 7 violations on record.