Is Mankato, MN 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 Mankato Water System.
Mankato Water System supplies Mankato (42,803 people).
Water system
Mankato Water System
42,803 people · Groundwater under influence of surface water · EPA ID MN1070009
| 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: 2 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: 0
Across Minnesota, 10 of 197 water systems EPA tested had PFAS above a 2024 federal limit, and 7 systems were above the lead action level in results from the last five years. Minnesota results.
Mankato 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 Mankato city (tables B25034, B25003). Estimates for small places have a margin of error.
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| Faribault 36 mi Faribault Water System | None above limits | 19 ppb |
| Owatonna 37 mi Owatonna Water System | None above limits | 2 ppb |
| Prior Lake 47 mi Prior Lake Water System | None above limits | 0 ppb |
| Chaska 48 mi Chaska Water System | None above limits | 6 ppb |
| Shakopee 48 mi Shakopee Water System | None above limits | 2 ppb |
| Lakeville 50 mi Lakeville Water System | None above limits | 0 ppb |
Mankato ZIP codes (1)
- 56001
Questions
Is Mankato tap water safe to drink?
Mankato Water System 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 Mankato, MN?
Mankato Water System, which serves 42,803 people.
Does Mankato tap water have PFAS?
None detected above EPA's reporting limits. Mankato Water System 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 Mankato homes have lead pipes?
Census estimates put 48% of Mankato homes as built before 1980 (Minnesota: 52%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Mankato Water System'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.