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Tap water quality report

Big Lake

EPA monitoring tested this supplier for 101 contaminants and detected 16. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

101
contaminants tested
16
detected
13,056
people served
7
health-based violations
Minnesota rankingsLead in MinnesotaPFAS in Minnesota
Water source
Ground water
Ownership
Local government
Counties served
Sherburne

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.

7
health-based violations
21
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1998-10-01 → 1998-10-31
MCL Health-based Resolved 1998-10-01 → 1998-10-31
MCL Health-based Resolved 1998-10-01 → 1998-10-31
MCL Health-based Resolved 1998-10-01 → 1998-10-31
MCL Health-based Resolved 1998-10-01 → 1998-10-31
MCL Health-based Resolved 1998-10-01 → 1998-10-31
MCL Health-based Resolved 1998-10-01 → 1998-10-31
MR Monitoring Resolved 2009-03-01 → 2009-03-31
MR Monitoring Resolved 2009-03-01 → 2009-03-31
MR Monitoring Resolved 2009-03-01 → 2009-03-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0155 µg/L 4/4 2024
Pfpea 0.0033 µg/L 1/4 2024

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
393.5 µg/L 30%
of the EPA limit 1300 µg/L
worst single sample: 550 µg/L
79/80 SYR4 2013–2019
Lead
8.5 µg/L 57%
of the EPA limit 15 µg/L
worst single sample: 129 µg/L
41/80 SYR4 2013–2019
Nitrate-Nitrite
5830 µg/L 58%
of the EPA limit 10000 µg/L
worst single sample: 6000 µg/L
38/38 SYR4 2012–2019
Fluoride
1100 µg/L 28%
of the EPA limit 4000 µg/L
worst single sample: 1200 µg/L
33/33 SYR4 2012–2019
Bromodichloromethane
5.325 µg/L
No EPA limit set
worst single sample: 5.4 µg/L
16/16 SYR4 2013–2019
Chloroform
5.55 µg/L
No EPA limit set
worst single sample: 6 µg/L
16/16 SYR4 2013–2019
Dibromoacetic Acid
1.625 µg/L
No EPA limit set
worst single sample: 1.7 µg/L
16/16 SYR4 2013–2019
Dibromochloromethane
4.125 µg/L
No EPA limit set
worst single sample: 4.2 µg/L
16/16 SYR4 2013–2019
Dichloroacetic Acid
2.375 µg/L
No EPA limit set
worst single sample: 2.6 µg/L
16/16 SYR4 2013–2019
Bromoform
1.09 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
15/16 SYR4 2013–2019
Trichloroacetic Acid
1.59 µg/L
No EPA limit set
worst single sample: 1.7 µg/L
12/16 SYR4 2013–2019
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 8/8 LCR 2025
Gross Alpha, Excl. Radon And U
12.7 pCi/L 85%
of the EPA limit 15 pCi/L
worst single sample: 14 pCi/L
6/6 SYR4 2013–2019
Barium
62.8 µg/L 3.1%
of the EPA limit 2000 µg/L
 1/1 SYR4 2017
85 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, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Phone
7632512979
Email
[email protected]

Frequently asked questions about Big Lake

Is Big Lake tap water safe to drink?

EPA monitoring detected 16 contaminants in Big 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 Big Lake's water?

EPA monitoring detected Copper, Lead, Nitrate-Nitrite, Fluoride, Bromodichloromethane, and others. The full list with the level and data source for each is above.

How many people does Big Lake serve?

Big Lake reports serving 13,056 people in Minnesota, per its EPA record.

Has Big Lake had any water quality violations?

The EPA has 21 violations on file for Big Lake, of which 7 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.