Is Palouse, WA Tap Water Safe to Drink?
Graded A with no contaminants above EPA limits. Here's everything we tested and how Palouse ranks. What to do next ↓
91.4/100
waterverge.com Palouse, WA — Water Quality Report
Palouse's drinking water received a grade of A (91.4 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 1,298 residents using groundwater.
Lead levels were measured at 3.2 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 37 violations on record, including 5 health-based violations. All violations have been resolved.
What to know about Palouse's water
Palouse ranks #28 out of 294 cities in Washington for water quality, placing it one of the best in the state.
Palouse 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, Palouse may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Palouse, WA water safe to drink?
Based on EPA testing data, Palouse's tap water is generally safe to drink. The water system earned a grade of A (91.4/100), meeting federal drinking water standards across key contaminant categories. The city's 1 water system serves approximately 1,298 residents using groundwater (wells).
Recent water quality updates for Palouse
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Palouse's water quality assessment. Grade: A (91.4/100).
Contaminants: Total Haloacetic Acids (HAA5), TTHM.
Contaminants: Arsenic.
Contaminants: Total Haloacetic Acids (HAA5), TTHM.
Federal disaster declaration (FEMA DR-3227). Coastal Storm event — may have impacted local water infrastructure.
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 Palouse's water supply.
Well within EPA limits.
Violation history
Palouse's water system has 37 total violations on record, including 5 health-based violations. All violations have been resolved. 2 violations were issued in the last 5 years.
Flood & environmental risk
Whitman County has experienced 7 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 Palouse River Nr Potlatch.
Where does Palouse's water come from?
Palouse's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,298 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Palouse River Nr Potlatch (river).
What Palouse 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.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
Palouse'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
Drought conditions
D2 — severe droughtWhitman 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
Whitman County has experienced 7 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. | 3.2 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Palouse compares by contaminant
Explore where Palouse ranks among all Washington cities for specific contaminants.
Water source & infrastructure
Where Palouse's water comes from
Palouse'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 1,298 people through 1 water system.
Water bodies near Palouse
Palouse is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Palouse
| System Name | PWSID | Population | Source |
|---|---|---|---|
| PALOUSE WATER DEPT CITY OF | WA5365800 | 1,298 | GW |
How Palouse compares
Full Washington rankings →Palouse's score of 91.4/100 is above the average of 53/100 among major Washington cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Washington rankings →About Palouse, WA
Learn more about your water
Guides and resources related to Palouse's water quality findings.
Explore water quality across Whitman
Frequently asked questions
Is Palouse, WA tap water safe to drink?
Palouse's water quality earned a grade of A (91.4/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #28 out of 294 cities tested in Washington.
What contaminants are in Palouse's water?
Lead was measured at 3.2 ppb (90th percentile). 37 violations are on record.
How is Palouse'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 Palouse?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Palouse's water come from?
Palouse's water is sourced from Groundwater. The city has 1 water system serving approximately 1,298 residents.
What health violations has Palouse's water system had?
Palouse has 5 health-based violations on record. The most recent violation was recorded in January 2022. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. All health violations have been resolved.
Is Palouse's groundwater at risk of contamination?
Palouse 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 37 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 Palouse's water compare to other cities?
Palouse ranks #28 out of 294 cities in Washington (better than 90% of state cities) and #1720 out of 15744 cities nationally (89th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Palouse's small water system affect quality?
Palouse's system serves approximately 1,298 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 37 violations on record.