Compliance record
Other contaminants detected
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of this
system's samples — over 100% is worth reading, but is not by itself a
violation. Where a single sample came in higher than that percentile, it
is noted under the bar. Formal violations are listed separately.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Copper | 1237.5 µg/L 95% of the EPA limit 1300 µg/L
worst single sample: 2730 µg/L | 90/90 | SYR4 | 2013–2019 |
| Lead | 8.3 µg/L 55% of the EPA limit 15 µg/L
worst single sample: 125 µg/L | 37/90 | SYR4 | 2013–2019 |
| Bromodichloromethane | 4.32 µg/L No EPA limit set
worst single sample: 6.1 µg/L | 33/35 | SYR4 | 2012–2019 |
| Chloroform | 13.2 µg/L No EPA limit set
worst single sample: 23 µg/L | 33/35 | SYR4 | 2012–2019 |
| Fluoride | 948 µg/L 24% of the EPA limit 4000 µg/L
worst single sample: 1000 µg/L | 33/33 | SYR4 | 2012–2019 |
| Dibromochloromethane | 3.67 µg/L No EPA limit set
worst single sample: 3.9 µg/L | 27/35 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 2.83 µg/L No EPA limit set
worst single sample: 3 µg/L | 18/29 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 14/14 | LCR | 2025 |
| Bromoform | 1.445 µg/L No EPA limit set
worst single sample: 1.5 µg/L | 12/35 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 260 µg/L 2.6% of the EPA limit 10000 µg/L | 12/30 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 1.63 µg/L No EPA limit set
worst single sample: 1.7 µg/L | 8/29 | SYR4 | 2012–2019 |
| Chromium | 0.2725 µg/L 0.3% of the EPA limit 100 µg/L
worst single sample: 0.2800 µg/L | 6/9 | SYR4 | 2012–2018 |
| Dibromoacetic Acid | 1.575 µg/L No EPA limit set
worst single sample: 1.6 µg/L | 6/29 | SYR4 | 2012–2019 |
| Barium | 327.18 µg/L 16% of the EPA limit 2000 µg/L
worst single sample: 360 µg/L | 3/3 | SYR4 | 2012–2018 |
| Lithium | 18.6 µg/L No EPA limit set | 2/2 | UCMR-5 | 2025 |
| Arsenic | 7.09 µg/L 71% of the EPA limit 10 µg/L | 1/3 | SYR4 | 2012–2018 |
| Gross Alpha, Excl. Radon And U | 6.2 pCi/L 41% of the EPA limit 15 pCi/L | 1/4 | SYR4 | 2012–2018 |
84 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Prior Lake
Is Prior Lake tap water safe to drink?
EPA monitoring detected 17 contaminants in Prior Lake's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in Prior Lake's water?
EPA monitoring detected Copper, Lead, Bromodichloromethane, Chloroform, Fluoride, and others. The full list with the level and data source for each is above.
How many people does Prior Lake serve?
Prior Lake reports serving 25,282 people in Minnesota, per its EPA record.
Has Prior Lake had any water quality violations?
The EPA has no formal drinking-water violations on file for Prior Lake.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.