GRAND LAKE PWA
PWSID: OK1021691 · Ochelata, OK · Serves 2,800 people
According to EPA Safe Drinking Water Information System (SDWIS), GRAND LAKE PWA (PWSID OK1021691) in Ochelata, OK is listed as a CWS water system covering about 2,800 people. The same extract lists 7 health-based violation records spanning 2023-2025. Those 7 health-based rows for GRAND LAKE PWA cover contaminants such as Combined Radium (-226 and -228); they remain historical EPA registry entries, not a current compliance or drinkability score.
GRAND LAKE PWA has 7 health-based violation records in this historical extract. Monitoring and reporting records are not included.
PlainEnviro's health-based SDWIS extract covers monitoring and reporting violations only -- it does not include unresolved enforcement actions in progress or corrective steps a utility has taken since the extract date. 1 distinct EPA contaminant code appears in this system's record, including Combined Radium (-226 and -228). Recorded violations span 2023–2025. Day-to-day primacy enforcement for this system runs through the Oklahoma drinking-water program, not EPA directly.
A historical health-based record does not necessarily describe current water quality or compliance. The most authoritative current source is the utility's annual Consumer Confidence Report. For enforcement history and corrective-action orders, consult EPA ECHO and the Oklahoma state drinking-water program's public portal.
System Details
- EPA ID (PWSID)
- OK1021691
- System Type
- CWS
- Water Source
- Groundwater
- Location
- Ochelata, OK
- Population Served
- 2,800
- Health Violations
- Yes (7)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| Combined Radium (-226 and -228) | 7 | 7 |
Violation History (7)
| Contaminant | Health | Date |
|---|---|---|
| Combined Radium (-226 and -228) | Yes | Jul 1, 2025 |
| Combined Radium (-226 and -228) | Yes | Jan 1, 2024 |
| Combined Radium (-226 and -228) | Yes | Jan 1, 2024 |
| Combined Radium (-226 and -228) | Yes | Jan 1, 2024 |
| Combined Radium (-226 and -228) | Yes | Oct 1, 2023 |
| Combined Radium (-226 and -228) | Yes | Oct 1, 2023 |
| Combined Radium (-226 and -228) | Yes | Oct 1, 2023 |
Frequently Asked Questions
What does EPA SDWIS list for GRAND LAKE PWA?
How many people does GRAND LAKE PWA serve?
What violations does GRAND LAKE PWA have?
What contaminants have been found in GRAND LAKE PWA water?
Compare beyond Oklahoma
Nationwide peers by violations & population served
Cross-state SDWIS systems nearest GRAND LAKE PWA on cumulative violation count (7) and EPA-reported population served (2,800). Violation-count peers include SANTEE UTILITY COMMISSION, CHEFORNAK WATER SYSTEM, LYNN WATER WORKS. Population peers include LERDO SHERIFF S FACILITY, LAND PROJECTS MUTUAL WATER CO., SEASIDE MUNICIPAL WATER SYSTEM.
Similar violation count
Nearest cross-state community systems (500+ served) by SDWIS violations on record.
Similar population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ gate).
Nearby Water Systems
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About This Data
GRAND LAKE PWA (OK1021691) is drawn from EPA SDWIS. Nearby county systems in this extract include DEWEY PUBLIC WORKS AUTHORITY; WASHINGTON CO RWD #2; WASHINGTON CO RWD #1; OSAGE CO RWD # 1. Health-based rows (7 MCL/TT) are historical registry state, not a current drinkability score.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.