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Tap water quality report

Rapid Valley Sanitary District

EPA monitoring tested this supplier for 50 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

50
contaminants tested
10
detected
11,408
people served
7
health-based violations
South Dakota rankingsLead in South DakotaPFAS in South Dakota
Water source
Surface water
Ownership
Local government
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.

7
health-based violations
13
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2007-11-01 → 2007-11-30
MCL Health-based Resolved 2007-11-01 → 2007-11-30
MCL Health-based Resolved 2007-11-01 → 2007-11-30
TT Health-based Resolved 1995-01-01 → 1995-12-31
TT Health-based Resolved 1995-01-01 → 1995-12-31
TT Health-based Resolved 1995-01-01 → 1995-12-31
TT Health-based Resolved 1995-01-01 → 1995-12-31
MR Monitoring Resolved 1988-08-31 → 1992-08-30
MR Monitoring Resolved 1988-08-31 → 1992-08-30
MR Monitoring Resolved 1988-08-31 → 1992-08-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFHXS 0.0058 µg/L 4/4 2024
PFOS 0.0057 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
339.6 µg/L 26%
of the EPA limit 1300 µg/L
worst single sample: 445 µg/L
60/60 SYR4 2012–2018
Lead
6.05 µg/L 40%
of the EPA limit 15 µg/L
worst single sample: 27 µg/L
60/60 SYR4 2012–2018
TTHM
73.75 µg/L 92%
of the EPA limit 80 µg/L
worst single sample: 102 µg/L
58/58 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
52.28 µg/L 87%
of the EPA limit 60 µg/L
worst single sample: 64.4 µg/L
53/58 SYR4 2012–2019
Lead
0.0030 mg/L 20%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2024
Nitrate
892 µg/L 8.9%
of the EPA limit 10000 µg/L
 2/6 SYR4 2017–2019
Lithium
23.4 µg/L
No EPA limit set
 2/4 UCMR-5 2024
Gross Alpha, Excl. Radon And U
0.8000 pCi/L 5.3%
of the EPA limit 15 pCi/L
 1/1 SYR4 2012
40 contaminants tested, none detected
11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicBariumBeryllium, TotalCadmiumChromiumCombined Radium (-226 And -228)Combined UraniumGross Beta Particle ActivityHfpo-DaMercuryNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPfmbaPfmpaPFNAPFOAPfpeaPfpesPftaPftrdaPfunaSeleniumThallium, Total

Utility contact

Contact
RUSTY SCHMIDT
Phone
6053931050
Email
[email protected]

Frequently asked questions about Rapid Valley Sanitary District

Is Rapid Valley Sanitary District tap water safe to drink?

EPA monitoring detected 10 contaminants in Rapid Valley Sanitary District'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 Rapid Valley Sanitary District'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 Rapid Valley Sanitary District serve?

Rapid Valley Sanitary District reports serving 11,408 people in South Dakota, per its EPA record.

Has Rapid Valley Sanitary District had any water quality violations?

The EPA has 13 violations on file for Rapid Valley Sanitary District, 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.