Tap WaterIndex

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Tap water quality report

Clark

EPA monitoring tested this supplier for 5 contaminants and detected 5. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

5
contaminants tested
5
detected
1,148
people served
2
health-based violations
South Dakota rankingsLead in South DakotaPFAS in South Dakota
Water source
GWP
Ownership
Local government
Counties served
Clark

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.

2
health-based violations
15
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2016-02-01
TT Health-based Resolved 2016-02-01
Other Monitoring Archived 2000-11-12 → 2000-12-11
MR Monitoring Resolved 2000-09-01 → 2000-09-30
MR Monitoring Resolved 2000-09-01 → 2000-09-30
MR Monitoring Resolved 2000-09-01 → 2000-09-30
Other Monitoring Resolved 2000-07-01 → 2000-07-21
Other Monitoring Resolved 2000-07-01 → 2000-07-21
MR Monitoring Resolved 1997-01-01 → 1997-10-07
MR Monitoring Resolved 1997-01-01 → 1997-10-07

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
82 µg/L 6.3%
of the EPA limit 1300 µg/L
worst single sample: 120 µg/L
20/20 SYR4 2014–2017
Lead
4.21 µg/L 28%
of the EPA limit 15 µg/L
worst single sample: 8.2 µg/L
20/20 SYR4 2014–2017
Lead
0.0040 mg/L 27%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2023
TTHM
34.66 µg/L 43%
of the EPA limit 80 µg/L
worst single sample: 36.2 µg/L
8/8 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
13.197 µg/L 22%
of the EPA limit 60 µg/L
worst single sample: 16.2 µg/L
8/8 SYR4 2013–2019

Utility contact

Contact
DARIN ALTFILLISCH
Phone
6055325665
Email
[email protected]

Frequently asked questions about Clark

Is Clark tap water safe to drink?

EPA monitoring detected 5 contaminants in Clark'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 Clark's water?

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

How many people does Clark serve?

Clark reports serving 1,148 people in South Dakota, per its EPA record.

Has Clark had any water quality violations?

The EPA has 15 violations on file for Clark, of which 2 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.