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Tap water quality report

Prairie Island

EPA monitoring tested this supplier for 104 contaminants and detected 15. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

104
contaminants tested
15
detected
6,699
people served
0
health-based violations
Minnesota rankingsLead in MinnesotaPFAS in Minnesota
Water source
Ground water
Ownership
Native American

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

0
health-based violations
178
violations on file
0
still open
ViolationTypeStatusPeriod
RPT Monitoring Resolved 2024-10-17
RPT Monitoring Resolved 2024-10-17
RPT Monitoring Resolved 2024-10-17
MR Monitoring Resolved 2023-10-01
MR Monitoring Resolved 2023-10-01
MR Monitoring Resolved 2023-10-01
RPT Monitoring Resolved 2023-08-01
RPT Monitoring Resolved 2023-08-01
RPT Monitoring Resolved 2023-08-01
MR Monitoring Resolved 2023-01-01 → 2023-12-31

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
141 µg/L 11%
of the EPA limit 1300 µg/L
worst single sample: 158 µg/L
21/21 SYR4 2014–2017
Lead
9.78 µg/L 65%
of the EPA limit 15 µg/L
worst single sample: 14.4 µg/L
12/21 SYR4 2014–2017
TTHM
4.9 µg/L 6.1%
of the EPA limit 80 µg/L
worst single sample: 6.1 µg/L
9/9 SYR4 2012–2019
Lead
0.0043 mg/L 29%
of the EPA limit 0.0150 mg/L
 8/8 LCR 2025
Total Haloacetic Acids (HAA5)
0.9275 µg/L 1.5%
of the EPA limit 60 µg/L
worst single sample: 1 µg/L
6/8 SYR4 2012–2019
Combined Radium (-226 And -228)
2.7723 pCi/L 55%
of the EPA limit 5 pCi/L
worst single sample: 2.83 pCi/L
2/3 SYR4 2013–2019
Fluoride
770 µg/L 19%
of the EPA limit 4000 µg/L
worst single sample: 800 µg/L
2/2 SYR4 2013–2016
Nitrate
200 µg/L 2%
of the EPA limit 10000 µg/L
 2/28 SYR4 2012–2019
Lithium
18 µg/L
No EPA limit set
 2/2 UCMR-5 2023
Barium
71.9 µg/L 3.6%
of the EPA limit 2000 µg/L
 1/2 SYR4 2013–2016
Beryllium, Total
0.0360 µg/L 0.9%
of the EPA limit 4 µg/L
 1/2 SYR4 2013–2016
Chromium
2.1 µg/L 2.1%
of the EPA limit 100 µg/L
 1/2 SYR4 2013–2016
Combined Uranium
0.0015 µg/L 0%
of the EPA limit 30 µg/L
 1/2 SYR4 2013–2016
Gross Alpha, Excl. Radon And U
0.1730 pCi/L 1.2%
of the EPA limit 15 pCi/L
 1/2 SYR4 2013–2016
Thallium, Total
0.0220 µg/L 1.1%
of the EPA limit 2 µg/L
 1/2 SYR4 2013–2016
89 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DUNN, TRAVIS
Email
[email protected]

Frequently asked questions about Prairie Island

Is Prairie Island tap water safe to drink?

EPA monitoring detected 15 contaminants in Prairie Island'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 Prairie Island's water?

EPA monitoring detected Copper, Lead, TTHM, Lead, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Prairie Island serve?

Prairie Island reports serving 6,699 people in Minnesota, per its EPA record.

Has Prairie Island had any water quality violations?

The EPA has 178 violations on file for Prairie Island, of which 0 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

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.