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Tap water quality report

Fort Thompson Water

EPA monitoring tested this supplier for 70 contaminants and detected 15. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

70
contaminants tested
15
detected
1,357
people served
39
health-based violations
South Dakota rankingsLead in South DakotaPFAS in South Dakota
Water source
Surface 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.

39
health-based violations
220
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2022-09-08
MCL Health-based Resolved 2013-08-01 → 2013-08-31
MCL Health-based Resolved 2013-08-01 → 2013-08-31
MCL Health-based Resolved 2012-04-01 → 2012-06-30
MCL Health-based Resolved 2012-01-01 → 2012-03-31
MCL Health-based Resolved 2011-10-01 → 2011-12-31
MCL Health-based Resolved 2011-07-01 → 2011-09-30
MCL Health-based Resolved 2011-01-01 → 2011-03-31
MCL Health-based Resolved 2011-01-01 → 2011-03-31
MCL Health-based Resolved 2006-10-01 → 2006-12-31

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
751.5 µg/L 58%
of the EPA limit 1300 µg/L
worst single sample: 820 µg/L
38/39 SYR4 2016–2019
Lead
1.215 µg/L 8.1%
of the EPA limit 15 µg/L
worst single sample: 1.4 µg/L
38/39 SYR4 2016–2019
TTHM
71.275 µg/L 89%
of the EPA limit 80 µg/L
worst single sample: 89.7 µg/L
36/36 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
63.725 µg/L 106%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
worst single sample: 76.3 µg/L
36/36 SYR4 2012–2019
Lead
0.00066 mg/L 4.4%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2025
Antimony, Total
0.3945 µg/L 6.6%
of the EPA limit 6 µg/L
worst single sample: 0.4000 µg/L
2/2 SYR4 2017–2019
Barium
34.02 µg/L 1.7%
of the EPA limit 2000 µg/L
worst single sample: 34.1 µg/L
2/2 SYR4 2017–2019
Chromium
0.9660 µg/L 1%
of the EPA limit 100 µg/L
worst single sample: 1 µg/L
2/2 SYR4 2017–2019
Gross Alpha, Excl. Radon And U
4.585 pCi/L 31%
of the EPA limit 15 pCi/L
worst single sample: 4.6 pCi/L
2/2 SYR4 2013–2019
Nitrate
200 µg/L 2%
of the EPA limit 10000 µg/L
 2/18 SYR4 2012–2019
Selenium
2.75 µg/L 5.5%
of the EPA limit 50 µg/L
worst single sample: 2.8 µg/L
2/2 SYR4 2017–2019
2,4-D
1 µg/L 1.4%
of the EPA limit 70 µg/L
 1/4 SYR4 2013–2017
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
 1/2 SYR4 2017–2019
Atrazine
0.4300 µg/L 14%
of the EPA limit 3 µg/L
 1/5 SYR4 2013–2018
Chlordane
0.4400 µg/L 22%
of the EPA limit 2 µg/L
 1/4 SYR4 2013–2017
55 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TPAsbestosBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitrate-NitriteNitriteOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
BIG EAGLE, DON
Phone
605-245-2544
Email
[email protected]

Frequently asked questions about Fort Thompson Water

Is Fort Thompson Water tap water safe to drink?

EPA monitoring detected 15 contaminants in Fort Thompson Water'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 Fort Thompson Water's water?

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

How many people does Fort Thompson Water serve?

Fort Thompson Water reports serving 1,357 people in South Dakota, per its EPA record.

Has Fort Thompson Water had any water quality violations?

The EPA has 220 violations on file for Fort Thompson Water, of which 39 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.