Tap WaterIndex

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Tap water quality report

Allen Water

EPA monitoring tested this supplier for 5 contaminants and detected 4. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

5
contaminants tested
4
detected
420
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
49
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1997-06-01 → 1997-06-30
MCL Health-based Archived 1994-09-01 → 1994-09-30
MCL Health-based Archived 1994-09-01 → 1994-09-30
MR Monitoring Resolved 2025-01-01 → 2025-12-31
MR Monitoring Resolved 2025-01-01 → 2025-12-31
MR Monitoring Archived 2024-01-01 → 2024-12-31
MR Monitoring Archived 2024-01-01 → 2024-12-31
MR Monitoring Resolved 2023-01-01
MR Monitoring Resolved 2022-09-29
MON Monitoring Resolved 2019-03-01 → 2019-03-31

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 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
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2025
Copper
742 µg/L 57%
of the EPA limit 1300 µg/L
 10/10 SYR4 2019
TTHM
38.4 µg/L 48%
of the EPA limit 80 µg/L
 3/3 SYR4 2013–2018
Total Haloacetic Acids (HAA5)
24.3 µg/L 41%
of the EPA limit 60 µg/L
 2/3 SYR4 2013–2018
1 contaminants tested, none detected
Lead

Utility contact

Contact
HERNANDEZ, MISTY
Phone
605-867-5804
Email
h20sewer@gwtc.net

Frequently asked questions about Allen Water

Is Allen Water tap water safe to drink?

EPA monitoring detected 4 contaminants in Allen 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 Allen Water's water?

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

How many people does Allen Water serve?

Allen Water reports serving 420 people in South Dakota, per its EPA record.

Has Allen Water had any water quality violations?

The EPA has 49 violations on file for Allen 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.