Water report · not indexed
What is in the water at 73534
2 public water systems serve this ZIP code in the federal records. Everything below comes from EPA monitoring data, and everything missing is named.
BRYAN CO. RWS & SWMD #2
PWSID OK1010604 · OK · serves 6,270 people
PFAS and lithium
Sampled, nothing detected. Tested for 30 compounds under UCMR 5 with none found at or above its reporting limit. A reporting limit is the lowest concentration the method can measure, so this means “below that” rather than “zero”.
Health-based violations
1 open health-based violation(s) recorded in SDWIS and not yet returned to compliance.
- TT · contaminant code 0300 · began 2026-01-01
Hardness
No hardness measurement. Hardness is measured at environmental monitoring stations, and none fell inside this system’s service area. That is a gap in where monitoring happens, not a finding about the water.
DUNCAN PUBLIC UTILITIES AUTHORITY
PWSID OK1010809 · OK
PFAS and lithium
5 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 25 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 14 µg/L | 8 | 7/10/2024 |
| PFBA | 0.0075 µg/L | 7 | 7/10/2024 |
| PFPeA | 0.0038 µg/L | 5 | 7/10/2024 |
| PFHpA | 0.0034 µg/L | 3 | 4/2/2024 |
| PFHxA | 0.0033 µg/L | 2 | 1/10/2024 |
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
26 open health-based violation(s) recorded in SDWIS and not yet returned to compliance.
- MCL · contaminant code 2950 · began 2016-01-01
- MCL · contaminant code 2456 · began 2016-07-01
- MCL · contaminant code 2456 · began 2016-10-01
- MCL · contaminant code 2950 · began 2016-10-01
- MCL · contaminant code 2456 · began 2017-01-01
- MCL · contaminant code 2950 · began 2017-01-01
- MCL · contaminant code 2950 · began 2018-07-01
- MCL · contaminant code 2950 · began 2018-10-01
Hardness
No hardness measurement. Hardness is measured at environmental monitoring stations, and none fell inside this system’s service area. That is a gap in where monitoring happens, not a finding about the water.
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.