WOODLAND PARK MUTUAL WATER CO
PWSID: CA4000506 · Arroyo Grande, CA · Serves 538 people
According to EPA Safe Drinking Water Information System (SDWIS), WOODLAND PARK MUTUAL WATER CO (PWSID CA4000506) in Arroyo Grande, CA is listed as a CWS water system covering about 538 people. The same extract lists 29 health-based violation records spanning 2023-2025. Those 29 health-based rows for WOODLAND PARK MUTUAL WATER CO cover contaminants such as Nitrate; they remain historical EPA registry entries, not a current compliance or drinkability score.
WOODLAND PARK MUTUAL WATER CO has 29 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 Nitrate. Recorded violations span 2023–2025. 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)
- CA4000506
- System Type
- CWS
- Water Source
- Groundwater
- Location
- Arroyo Grande, CA
- Population Served
- 538
- Health Violations
- Yes (29)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| Nitrate | 29 | 29 |
Violation History (29)
| Contaminant | Health | Date |
|---|---|---|
| Nitrate | Yes | Oct 1, 2025 |
| Nitrate | Yes | Jul 1, 2025 |
| Nitrate | Yes | Apr 1, 2025 |
| Nitrate | Yes | Apr 1, 2025 |
| Nitrate | Yes | Jan 1, 2025 |
| Nitrate | Yes | Jan 1, 2025 |
| Nitrate | Yes | Oct 1, 2024 |
| Nitrate | Yes | Oct 1, 2024 |
| Nitrate | Yes | Oct 1, 2024 |
| Nitrate | Yes | Jul 1, 2024 |
| Nitrate | Yes | Jul 1, 2024 |
| Nitrate | Yes | Jul 1, 2024 |
| Nitrate | Yes | Jul 1, 2024 |
| Nitrate | Yes | Apr 1, 2024 |
| Nitrate | Yes | Apr 1, 2024 |
| Nitrate | Yes | Apr 1, 2024 |
| Nitrate | Yes | Jan 1, 2024 |
| Nitrate | Yes | Jan 1, 2024 |
| Nitrate | Yes | Jan 1, 2024 |
| Nitrate | Yes | Oct 1, 2023 |
| Nitrate | Yes | Oct 1, 2023 |
| Nitrate | Yes | Oct 1, 2023 |
| Nitrate | Yes | Oct 1, 2023 |
| Nitrate | Yes | Apr 1, 2023 |
| Nitrate | Yes | Apr 1, 2023 |
| Nitrate | Yes | Apr 1, 2023 |
| Nitrate | Yes | Apr 1, 2023 |
| Nitrate | Yes | Apr 1, 2023 |
| Nitrate | Yes | Apr 1, 2023 |
Frequently Asked Questions
What does EPA SDWIS list for WOODLAND PARK MUTUAL WATER CO?
How many people does WOODLAND PARK MUTUAL WATER CO serve?
What violations does WOODLAND PARK MUTUAL WATER CO have?
What contaminants have been found in WOODLAND PARK MUTUAL WATER CO water?
Compare beyond California
Nationwide peers by violations & population served
Cross-state SDWIS systems nearest WOODLAND PARK MUTUAL WATER CO on cumulative violation count (29) and EPA-reported population served (538). Violation-count peers include EAST LOGAN CO RURAL WATER, BIG PARK WATER COMPANY, CAMP INN ASSOCIATES, LLC. Population peers include TALL PINES RESORT COMMUNITY SYS1, DEERFIELD PARK, VERNON WATER DEPARTMENT.
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
WOODLAND PARK MUTUAL WATER CO (CA4000506) is drawn from EPA SDWIS. Nearby county systems in this extract include SAN LUIS OBISPO WATER DEPARTMENT; CITY OF PASO ROBLES WATER DIVISION; ATASCADERO MUTUAL WATER CO; CITY OF ARROYO GRANDE UTILITIES DIVISION. Health-based rows (29 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.