Is Custer Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Custer

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.

health-based violations

110

violations on file

still open

Violation	Type	Status	Period
MR	Monitoring	Resolved	1998-07-01 → 1999-05-05
MR	Monitoring	Resolved	1998-07-01 → 1999-05-05
MR	Monitoring	Resolved	1998-07-01 → 1999-05-05
MR	Monitoring	Resolved	1996-07-01 → 1997-06-09
MR	Monitoring	Resolved	1996-07-01 → 1997-06-09
MR	Monitoring	Resolved	1996-07-01 → 1997-06-09
MR	Monitoring	Resolved	1996-01-01 → 1998-12-31
MR	Monitoring	Resolved	1996-01-01 → 1998-12-31
MR	Monitoring	Resolved	1996-01-01 → 1998-12-31
MR	Monitoring	Resolved	1996-01-01 → 1998-12-31

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Copper	1310.5 µg/L 101% of the EPA limit, at the 95th percentile of samples — 1300 µg/L worst single sample: 1470 µg/L	80/80	SYR4	2012–2017
Lead	3 µg/L 20% of the EPA limit 15 µg/L worst single sample: 23 µg/L	45/80	SYR4	2012–2017
Lead	0.0020 mg/L 13% of the EPA limit 0.0150 mg/L	19/19	LCR	2023
Nitrate	2770 µg/L 28% of the EPA limit 10000 µg/L	14/22	SYR4	2017–2019
TTHM	43.38 µg/L 54% of the EPA limit 80 µg/L worst single sample: 43.8 µg/L	8/8	SYR4	2013–2019
Gross Alpha, Excl. Radon And U	6.205 pCi/L 41% of the EPA limit 15 pCi/L worst single sample: 6.4 pCi/L	4/4	SYR4	2014–2019
Total Haloacetic Acids (HAA5)	8.22 µg/L 14% of the EPA limit 60 µg/L worst single sample: 8.3 µg/L	3/8	SYR4	2013–2019
Barium	52 µg/L 2.6% of the EPA limit 2000 µg/L	1/1	SYR4	2018
Fluoride	500 µg/L 13% of the EPA limit 4000 µg/L	1/1	SYR4	2018

12 contaminants tested, none detected

Antimony, TotalArsenicBeryllium, TotalCadmiumChromiumCombined Radium (-226 And -228)Combined UraniumGross Beta Particle ActivityMercuryNitriteSeleniumThallium, Total

Utility contact

Contact: BRIAN RABER
Phone: 6056734824
Email: [email protected]; ctybrian@gold

Frequently asked questions about Custer

Is Custer tap water safe to drink?

EPA monitoring detected 9 contaminants in Custer'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 Custer's water?

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

How many people does Custer serve?

Custer reports serving 1,919 people in South Dakota, per its EPA record.

Has Custer had any water quality violations?

The EPA has 110 violations on file for Custer, 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.