Is Lewiston, ID tap water safe?
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data for City of Lewiston. 3 PFAS were detected below the limits.
City of Lewiston supplies Lewiston (15,001 people).
Water system
City of Lewiston
15,001 people · Surface water · EPA ID ID2350014
| PFAS | Highest average | Limit |
|---|---|---|
| PFOA Not detected | – | 4 ppt |
| PFOS Not detected | – | 4 ppt |
| PFHxS Not detected | – | 10 ppt |
| PFNA Not detected | – | 10 ppt |
| HFPO-DA (GenX) Not detected | – | 10 ppt |
ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.
Lead: 0 ppb at the 90th percentile (Nov 2026, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0
Across Idaho, 2 of 61 water systems EPA tested had PFAS above a 2024 federal limit, and 1 system were above the lead action level in results from the last five years. Idaho results.
Lewiston homes and lead pipes
Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.
Housing: Census American Community Survey 2020–2024 5-year estimates for Lewiston city (tables B25034, B25003). Estimates for small places have a margin of error.
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| Moscow 23 mi Moscow Water Dept | None above limits | 4 ppb |
| Coeur d'Alene 91 mi City of Coeur D Alene | None above limits | 2 ppb |
| Post Falls 92 mi City of Post Falls | None above limits | 1 ppb |
| Eagle 189 mi Veolia Water Idaho | None above limits | 2 ppb |
| Caldwell 190 mi City of Caldwell | None above limits | 0 ppb |
| Meridian 194 mi Veolia Water Idaho | None above limits | 2 ppb |
Lewiston ZIP codes (1)
- 83501
Questions
Is Lewiston tap water safe to drink?
City of Lewiston has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.
Who supplies water in Lewiston, ID?
City of Lewiston, which serves 15,001 people.
Does Lewiston tap water have PFAS?
City of Lewiston had 3 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.
Do Lewiston homes have lead pipes?
Census estimates put 66% of Lewiston homes as built before 1980 (Idaho: 39%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. City of Lewiston's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.