WILLOW PARK MARINA
PWSID: CA0707507 · Oakley, CA · Serves 380 people
According to EPA Safe Drinking Water Information System (SDWIS), WILLOW PARK MARINA (PWSID CA0707507) in Oakley, CA is listed as a CWS water system covering about 380 people. The same extract lists 31 health-based violation records spanning 2021-2025. Those 31 health-based rows for WILLOW PARK MARINA cover contaminants such as Arsenic; they remain historical EPA registry entries, not a current compliance or drinkability score.
WILLOW PARK MARINA has 31 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 Arsenic. Recorded violations span 2021–2025. Day-to-day primacy enforcement for this system runs through the California 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 California state drinking-water program's public portal.
System Details
- EPA ID (PWSID)
- CA0707507
- System Type
- CWS
- Water Source
- Groundwater
- Location
- Oakley, CA
- Population Served
- 380
- Health Violations
- Yes (31)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| Arsenic | 31 | 31 |
Violation History (31)
| Contaminant | Health | Date |
|---|---|---|
| Arsenic | Yes | Oct 1, 2025 |
| Arsenic | Yes | Jul 1, 2025 |
| Arsenic | Yes | Apr 1, 2025 |
| Arsenic | Yes | Jan 1, 2025 |
| Arsenic | Yes | Oct 1, 2024 |
| Arsenic | Yes | Oct 1, 2024 |
| Arsenic | Yes | Jul 1, 2024 |
| Arsenic | Yes | Jul 1, 2024 |
| Arsenic | Yes | Apr 1, 2024 |
| Arsenic | Yes | Apr 1, 2024 |
| Arsenic | Yes | Jan 1, 2024 |
| Arsenic | Yes | Jan 1, 2024 |
| Arsenic | Yes | Oct 1, 2023 |
| Arsenic | Yes | Oct 1, 2023 |
| Arsenic | Yes | Jul 1, 2023 |
| Arsenic | Yes | Jul 1, 2023 |
| Arsenic | Yes | Apr 1, 2023 |
| Arsenic | Yes | Apr 1, 2023 |
| Arsenic | Yes | Jan 1, 2023 |
| Arsenic | Yes | Jan 1, 2023 |
| Arsenic | Yes | Oct 1, 2022 |
| Arsenic | Yes | Oct 1, 2022 |
| Arsenic | Yes | Jul 1, 2022 |
| Arsenic | Yes | Jul 1, 2022 |
| Arsenic | Yes | Apr 1, 2022 |
| Arsenic | Yes | Apr 1, 2022 |
| Arsenic | Yes | Jan 1, 2022 |
| Arsenic | Yes | Oct 1, 2021 |
| Arsenic | Yes | Jul 1, 2021 |
| Arsenic | Yes | Apr 1, 2021 |
| Arsenic | Yes | Jan 1, 2021 |
Frequently Asked Questions
What does EPA SDWIS list for WILLOW PARK MARINA?
How many people does WILLOW PARK MARINA serve?
What violations does WILLOW PARK MARINA have?
What contaminants have been found in WILLOW PARK MARINA water?
Compare beyond California
Nationwide peers by violations & population served
Cross-state SDWIS systems nearest WILLOW PARK MARINA on cumulative violation count (31) and EPA-reported population served (380). Violation-count peers include WALKER WATER ASSOCIATION, PRAIRIE GROVE WATERWORKS, BELLEVILLE WATER.
Similar violation count
Nearest cross-state community systems (500+ served) by SDWIS violations on record.
Nearby Water Systems
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About This Data
WILLOW PARK MARINA (CA0707507) is drawn from EPA SDWIS. Nearby county systems in this extract include CONTRA COSTA WATER DISTRICT; CITY OF ANTIOCH; BRENTWOOD; CITY OF PITTSBURG. Health-based rows (31 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.