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Tap water quality report

Rimrock Ridge Water Association

EPA monitoring tested this supplier for 21 contaminants and detected 8. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

21
contaminants tested
8
detected
35
people served
12
health-based violations
South Dakota rankingsLead in South DakotaPFAS in South Dakota
Water source
Ground water
Ownership
Private
Counties served
Pennington

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.

12
health-based violations
99
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1995-08-01 → 1995-08-31
MCL Health-based Resolved 1995-08-01 → 1995-08-31
MCL Health-based Resolved 1995-08-01 → 1995-08-31
MCL Health-based Resolved 1994-07-01 → 1994-07-31
MCL Health-based Resolved 1994-07-01 → 1994-07-31
MCL Health-based Resolved 1994-07-01 → 1994-07-31
MCL Health-based Resolved 1993-06-01 → 1993-06-30
MCL Health-based Resolved 1993-06-01 → 1993-06-30
MCL Health-based Resolved 1993-06-01 → 1993-06-30
MCL Health-based Resolved 1992-04-01 → 1992-04-30

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
1060 µg/L 82%
of the EPA limit 1300 µg/L
 15/15 SYR4 2013–2019
Lead
3 µg/L 20%
of the EPA limit 15 µg/L
 15/15 SYR4 2013–2019
Lead
0.0040 mg/L 27%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2025
Nitrate
933 µg/L 9.3%
of the EPA limit 10000 µg/L
 4/6 SYR4 2017–2019
TTHM
3.21 µg/L 4%
of the EPA limit 80 µg/L
 2/3 SYR4 2013–2019
Barium
79 µg/L 4%
of the EPA limit 2000 µg/L
 1/1 SYR4 2013
Fluoride
200 µg/L 5%
of the EPA limit 4000 µg/L
 1/1 SYR4 2013
Gross Alpha, Excl. Radon And U
2.58 pCi/L 17%
of the EPA limit 15 pCi/L
 1/1 SYR4 2016
13 contaminants tested, none detected
Antimony, TotalArsenicBeryllium, TotalCadmiumChromiumCombined Radium (-226 And -228)Combined UraniumGross Beta Particle ActivityMercuryNitriteSeleniumThallium, TotalTotal Haloacetic Acids (HAA5)

Utility contact

Contact
BRANDON POWLES
Phone
6054312678
Email
brandonpowles@yahoo.com

Frequently asked questions about Rimrock Ridge Water Association

Is Rimrock Ridge Water Association tap water safe to drink?

EPA monitoring detected 8 contaminants in Rimrock Ridge Water Association'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 Rimrock Ridge Water Association'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 Rimrock Ridge Water Association serve?

Rimrock Ridge Water Association reports serving 35 people in South Dakota, per its EPA record.

Has Rimrock Ridge Water Association had any water quality violations?

The EPA has 99 violations on file for Rimrock Ridge Water Association, of which 12 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.