B77/100
Prior Lake Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 50,241 residents · Minnesota
What's In Prior Lake's Tap Water?
66
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 297.00 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
This system has a clean compliance history.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
SOUTH WATER TREATMENT PLANT (SWTP)
Population Served
24,959
Water Source
Groundwater
System ID
055294506
Prior Lake
Population Served
25,282
Water Source
Groundwater
System ID
MN1700007
Frequently Asked Questions About Prior Lake Water
Is Prior Lake tap water safe to drink?
Prior Lake, Minnesota tap water receives a grade of B (77/100), which is considered good. Out of 66 contaminants tested, none exceed EPA maximum contaminant levels (MCLs) and 2 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Prior Lake's water?
Of the 66 contaminants tested in Prior Lake's water supply, the most notable include Lead (90th percentile), chlorate. No contaminants exceed EPA legal limits. 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Prior Lake have any water quality violations?
Yes, Prior Lake has 38 EPA violation(s) on record, with the most recent in 2019. Violation types include MR, MON, MCL. 1 of these are health-based violations, which are the most serious category.
Do I need a water filter in Prior Lake?
Prior Lake water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 2 contaminant(s) exceed these stricter goals.
Where does Prior Lake's tap water come from?
Prior Lake's drinking water is sourced from groundwater and supplied by SOUTH WATER TREATMENT PLANT (SWTP) and 1 other water system(s). The system serves approximately 50,241 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Prior Lake's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Prior Lake's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Prior Lake's water compare to other cities in Minnesota?
Prior Lake's water quality score of 77/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our Minnesota state page to see how all cities in the state compare.
What should I do if I'm concerned about Prior Lake's water quality?
If you have concerns about Prior Lake's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (SOUTH WATER TREATMENT PLANT (SWTP)) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.