Water Quality in CALVIN, OK (74531)
EPA violation data for public water systems serving ZIP code 74531.
19
Total Violations
0
Health-Based
19
Monitoring / Reporting
19
Resolved
What does this mean?
19 of 19 violations have been resolved. None of these are health-based violations — no contaminant levels exceeded federal safety limits. The remaining 19 are monitoring or reporting violations (missed testing deadlines or late paperwork — not necessarily a water quality issue). Not all violations mean your water is unsafe. The EPA requires reporting even for minor administrative issues.
Violations Detail (19 total)
| Contaminant | Category | MCL Limit | Measured | Date | Status | Health Effects |
|---|---|---|---|---|---|---|
| Consumer Confidence Rule | Monitoring | N/A | N/A | Jun 30, 2025 | Resolved | N/A |
| Consumer Confidence Rule | Monitoring | N/A | N/A | Oct 1, 2023 | Resolved | N/A |
| Consumer Confidence Rule | Monitoring | N/A | N/A | Oct 1, 2023 | Resolved | N/A |
| Gross Alpha, Excl. Radon and U | Monitoring | N/A | N/A | Mar 31, 2021 | Resolved | N/A |
| Combined Uranium | Monitoring | N/A | N/A | Mar 31, 2021 | Resolved | N/A |
| Gross Alpha, Excl. Radon and U | Monitoring | N/A | N/A | Mar 31, 2021 | Resolved | N/A |
| Gross Alpha, Excl. Radon and U | Monitoring | N/A | N/A | Mar 31, 2021 | Resolved | N/A |
| Gross Alpha, Excl. Radon and U | Monitoring | N/A | N/A | Mar 31, 2021 | Resolved | N/A |
| Combined Uranium | Monitoring | N/A | N/A | Mar 31, 2021 | Resolved | N/A |
| Combined Uranium | Monitoring | N/A | N/A | Mar 31, 2021 | Resolved | N/A |
Lead & Copper Levels
Violation Timeline
2025(1)
Consumer Confidence Rule
71
2023(2)
Consumer Confidence Rule
72
Consumer Confidence Rule
72
How Does This Compare?
CALVIN (74531) has 19 recorded violations, none of which are health-based. All violations have been resolved, which is a positive sign for current water quality. Consider testing your tap water independently for added peace of mind.
Recommended Water Filters
Based on the contaminants detected in your area, these filter types may help improve your water quality.
Whole House Carbon Filter
A solid baseline for improving overall water quality. Reduces chlorine, sediment, and many common contaminants throughout your entire home.
Targets:Chlorine, Sediment, Taste & Odor
Look for:NSF/ANSI 42 certified
Always look for filters certified by NSF International for the specific contaminants you want to remove.