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Tap water quality report

Crow Creek Sioux Tribe Water

EPA monitoring tested this supplier for 71 contaminants and detected 13. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

71
contaminants tested
13
detected
130
people served
0
health-based violations
South Dakota rankingsLead in South DakotaPFAS in South Dakota
Water source
SWP
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
190
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2024-12-30
MR Monitoring Resolved 2024-01-01 → 2024-12-31
MR Monitoring Resolved 2024-01-01 → 2024-12-31
MR Monitoring Resolved 2023-10-01
MR Monitoring Resolved 2021-09-29
MON Monitoring Resolved 2021-06-01 → 2021-06-30
MR Monitoring Resolved 2012-04-01 → 2012-04-30
MR Monitoring Resolved 2012-04-01 → 2012-04-30
MR Monitoring Resolved 2012-04-01 → 2012-04-30
Other Monitoring Resolved 2011-07-01

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
347 µg/L 27%
of the EPA limit 1300 µg/L
worst single sample: 500 µg/L
18/19 SYR4 2016–2019
Lead
0.7170 µg/L 4.8%
of the EPA limit 15 µg/L
worst single sample: 0.8500 µg/L
15/19 SYR4 2016–2019
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 11/11 LCR 2025
Arsenic
3.9 µg/L 39%
of the EPA limit 10 µg/L
worst single sample: 4 µg/L
2/2 SYR4 2017–2019
Barium
28.89 µg/L 1.4%
of the EPA limit 2000 µg/L
worst single sample: 29 µg/L
2/2 SYR4 2017–2019
TTHM
3.2265 µg/L 4%
of the EPA limit 80 µg/L
worst single sample: 3.37 µg/L
2/3 SYR4 2014–2018
Total Haloacetic Acids (HAA5)
4.3915 µg/L 7.3%
of the EPA limit 60 µg/L
worst single sample: 4.56 µg/L
2/3 SYR4 2014–2018
Chromium
3.7 µg/L 3.7%
of the EPA limit 100 µg/L
 1/2 SYR4 2017–2019
Fluoride
360 µg/L 9%
of the EPA limit 4000 µg/L
 1/1 SYR4 2019
Gross Alpha, Excl. Radon And U
3.5 pCi/L 23%
of the EPA limit 15 pCi/L
 1/2 SYR4 2013–2019
Mercury
0.5600 µg/L 28%
of the EPA limit 2 µg/L
 1/2 SYR4 2017–2019
Nitrate-Nitrite
90 µg/L 0.9%
of the EPA limit 10000 µg/L
 1/3 SYR4 2017–2019
Nitrite
90 µg/L 9%
of the EPA limit 1000 µg/L
 1/3 SYR4 2016–2019
58 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorNitrateOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, 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 Crow Creek Sioux Tribe Water

Is Crow Creek Sioux Tribe Water tap water safe to drink?

EPA monitoring detected 13 contaminants in Crow Creek Sioux Tribe 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 Crow Creek Sioux Tribe Water's water?

EPA monitoring detected Copper, Lead, Lead, Arsenic, Barium, and others. The full list with the level and data source for each is above.

How many people does Crow Creek Sioux Tribe Water serve?

Crow Creek Sioux Tribe Water reports serving 130 people in South Dakota, per its EPA record.

Has Crow Creek Sioux Tribe Water had any water quality violations?

The EPA has 190 violations on file for Crow Creek Sioux Tribe Water, 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.