Tap WaterIndex

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Tap water quality report

Mission Water

EPA monitoring tested this supplier for 35 contaminants and detected 6. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

35
contaminants tested
6
detected
1,500
people served
3
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.

3
health-based violations
15
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2014-07-01 → 2014-07-31
MCL Health-based Resolved 2014-07-01 → 2014-07-31
MCL Health-based Resolved 2009-04-01 → 2009-04-30
MON Monitoring Resolved 2025-09-01 → 2025-09-30
MR Monitoring Resolved 2025-09-01 → 2025-09-30
RPT Monitoring Resolved 2024-03-11
MR Monitoring Resolved 2023-01-01
MR Monitoring Resolved 2022-09-01 → 2023-08-31
MR Monitoring Resolved 2022-09-01 → 2023-08-31
MR Monitoring Resolved 2022-07-01

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
TTHM
51.55 µg/L 64%
of the EPA limit 80 µg/L
worst single sample: 58.9 µg/L
23/23 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
35.8 µg/L 60%
of the EPA limit 60 µg/L
worst single sample: 39.3 µg/L
21/23 SYR4 2013–2019
Lead
0.00059 mg/L 3.9%
of the EPA limit 0.0150 mg/L
 10/10 LCR 2025
Lead
6.94 µg/L 46%
of the EPA limit 15 µg/L
worst single sample: 10.9 µg/L
10/10 SYR4 2018
Copper
252.5 µg/L 19%
of the EPA limit 1300 µg/L
worst single sample: 270 µg/L
8/10 SYR4 2018
Lithium
69 µg/L
No EPA limit set
 4/4 UCMR-5 2023
29 contaminants tested, none detected
11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaHfpo-DaNetfosaaNfdhaNmefosaaPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfuna

Utility contact

Contact
PETERSEN, HEATHER
Phone
605-856-4499
Email
[email protected]

Frequently asked questions about Mission Water

Is Mission Water tap water safe to drink?

EPA monitoring detected 6 contaminants in Mission 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 Mission Water's water?

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

How many people does Mission Water serve?

Mission Water reports serving 1,500 people in South Dakota, per its EPA record.

Has Mission Water had any water quality violations?

The EPA has 15 violations on file for Mission Water, of which 3 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.