Owanka Rural Water System
Owanka Rural Water System (EPA ID SD4602310) in Black Hawk, SD supplies groundwater (wells) to about 52 people: 20 violations since 2016, latest lead result 2 ppb, PFAS not tested.
Health-based violations since 2016: Combined Radium (-226 and -228). All are listed as resolved.
90th-percentile lead in the latest round (Jan 2025). Lead comes mostly from household plumbing and service lines, so individual homes can be higher.
This system was not part of EPA’s 2023–2025 nationwide PFAS testing (UCMR 5 covers systems serving over 3,300 people and a sample of smaller ones).
Service area
EPA service-area boundary (state-supplied or EPA-modeled)System facts
Health-based violations
| Contaminant or rule | Health-based violations since 2016 |
|---|---|
| Combined Radium (-226 and -228) | 20 |
A health-based violation means a contaminant exceeded its legal limit (MCL) or a required treatment technique was not met, as reported by the state to EPA’s SDWIS. All are listed as resolved or archived; the latest began Oct 2020.
Lead
90th-percentile lead per sampling round (90% of the homes sampled were at or below this level). Black line: EPA’s 15 ppb action level; under the Lead and Copper Rule Improvements the action level becomes 10 ppb from 2027.
PFAS
This system was not part of EPA’s 2023–2025 nationwide PFAS testing (UCMR 5).
What this is — and isn’t. These are records your water utility and state reported to the EPA, and the EPA’s radon map for your county. They describe the system and the area, not the water from your own tap or the air in your home. For that, read your utility’s annual Consumer Confidence Report and test: lead and radon tests are inexpensive.
Questions
Has Owanka Rural Water System had drinking water violations?
Health-based violations since 2016: Combined Radium (-226 and -228). All are listed as resolved.
What is the lead level in Owanka Rural Water System water?
The latest 90th-percentile lead result (Jan 2025) was 2 ppb. EPA’s action level is 15 ppb (10 ppb from 2027).
Does Owanka Rural Water System have PFAS in its water?
This system was not part of EPA’s 2023–2025 nationwide PFAS testing (UCMR 5 covers systems serving over 3,300 people and a sample of smaller ones).