DELTA MUTUAL WATER COMPANY
PWSID: CA0707573 · Oakley, CA · Serves 333 people
According to EPA Safe Drinking Water Information System (SDWIS), DELTA MUTUAL WATER COMPANY (PWSID CA0707573) in Oakley, CA is listed as a CWS water system covering about 333 people. The same extract lists 40 health-based violation records spanning 2020-2025. Those 40 health-based rows for DELTA MUTUAL WATER COMPANY cover contaminants such as Arsenic; they remain historical EPA registry entries, not a current compliance or drinkability score.
DELTA MUTUAL WATER COMPANY has 40 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 2020–2025. 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)
- CA0707573
- System Type
- CWS
- Water Source
- Groundwater
- Location
- Oakley, CA
- Population Served
- 333
- Health Violations
- Yes (40)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| Arsenic | 40 | 40 |
Violation History (40)
| Contaminant | Health | Date |
|---|---|---|
| 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 | 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 | Jan 1, 2023 |
| Arsenic | Yes | Oct 1, 2022 |
| Arsenic | Yes | Oct 1, 2022 |
| Arsenic | Yes | Oct 1, 2022 |
| Arsenic | Yes | Jul 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 | Jan 1, 2022 |
| Arsenic | Yes | Oct 1, 2021 |
| Arsenic | Yes | Oct 1, 2021 |
| Arsenic | Yes | Jul 1, 2021 |
| Arsenic | Yes | Jul 1, 2021 |
| Arsenic | Yes | Apr 1, 2021 |
| Arsenic | Yes | Apr 1, 2021 |
| Arsenic | Yes | Jan 1, 2021 |
| Arsenic | Yes | Jan 1, 2021 |
| Arsenic | Yes | Oct 1, 2020 |
| Arsenic | Yes | Oct 1, 2020 |
| Arsenic | Yes | Jul 1, 2020 |
| Arsenic | Yes | Jul 1, 2020 |
| Arsenic | Yes | Apr 1, 2020 |
| Arsenic | Yes | Apr 1, 2020 |
| Arsenic | Yes | Jan 1, 2020 |
| Arsenic | Yes | Jan 1, 2020 |
Frequently Asked Questions
What does EPA SDWIS list for DELTA MUTUAL WATER COMPANY?
How many people does DELTA MUTUAL WATER COMPANY serve?
What violations does DELTA MUTUAL WATER COMPANY have?
What contaminants have been found in DELTA MUTUAL WATER COMPANY water?
Compare beyond California
Nationwide peers by violations & population served
Cross-state SDWIS systems nearest DELTA MUTUAL WATER COMPANY on cumulative violation count (40) and EPA-reported population served (333). Violation-count peers include KOTLIK WATER SYSTEM, DIAMOND CITY WATER, DES ARC WATERWORKS.
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
DELTA MUTUAL WATER COMPANY (CA0707573) 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 (40 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.