Is Post Falls, 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 Post Falls.
City of Post Falls supplies Post Falls (20,285 people).
Water system
City of Post Falls
20,285 people · Groundwater · EPA ID ID1280147
| 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: 1 ppb at the 90th percentile (Dec 2025, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 1
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.
Post Falls 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 Post Falls city (tables B25034, B25003). Estimates for small places have a margin of error.
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| Coeur d'Alene 7 mi City of Coeur D Alene | None above limits | 2 ppb |
| Moscow 68 mi Moscow Water Dept | None above limits | 4 ppb |
| Lewiston 92 mi City of Lewiston | None above limits | 0 ppb |
| Eagle 279 mi Veolia Water Idaho | None above limits | 2 ppb |
| Caldwell 281 mi City of Caldwell | None above limits | 0 ppb |
| Meridian 285 mi Veolia Water Idaho | None above limits | 2 ppb |
Post Falls ZIP codes (1)
- 83854
Questions
Is Post Falls tap water safe to drink?
City of Post Falls had 1 health-based violation 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 Post Falls, ID?
City of Post Falls, which serves 20,285 people.
Does Post Falls tap water have PFAS?
None detected above EPA's reporting limits. City of Post Falls had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.
Do Post Falls homes have lead pipes?
Census estimates put 16% of Post Falls 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 Post Falls'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.