Water report · not indexed
What is in the water at 57645
One public water system serves this ZIP code in the federal records. Everything below comes from EPA monitoring data, and everything missing is named.
STANDING ROCK RURAL WATER SYSTEM
PWSID 084690510 · 8 · serves 6,839 people
PFAS and lithium
1 compound detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 4 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 60 µg/L | 4 | 7/9/2024 |
A detection is a measurement, not a violation and not a health finding. EPA states that UCMR 5 results do not indicate compliance or non-compliance with any limit.
Health-based violations
1 open health-based violation(s) recorded in SDWIS and not yet returned to compliance.
- TT · contaminant code 0800 · began 2024-10-19
Hardness
Median hardness 82 mg/L as CaCO₃, measured at 5 stations serving this system across 5 results, 2015-04-20 to 2023-05-23. Measured in the water source and distribution area, not at a tap, and not in your home.
What this report cannot tell you
Every figure describes water at a sampling point: a treatment plant, an entry point to the distribution system, or a monitoring station. None of it describes water arriving at your tap. Plumbing between the two can add lead and copper, and if your home was built before 1986 a test kit tells you something no federal dataset can.
Sources: EPA UCMR 5 occurrence (final release, frozen July 2026) · EPA SDWIS health-based violations · USGS and state monitoring via the Water Quality Portal · EPA Public Water System Service Area Boundaries v3. Compiled 2026-09-01.