WESTERN HILLS WATER DISTRICT/DIABLO GRAN
PWSID: CA5010039 · Patterson, CA · Serves 2,000 people
According to EPA Safe Drinking Water Information System (SDWIS), WESTERN HILLS WATER DISTRICT/DIABLO GRAN (PWSID CA5010039) in Patterson, CA is listed as a CWS water system covering about 2,000 people. The same extract lists 8 health-based violation records spanning 2006-2017. Those 8 health-based rows for WESTERN HILLS WATER DISTRICT/DIABLO GRAN cover contaminants such as TTHM, Surface Water Treatment Rule; they remain historical EPA registry entries, not a current compliance or drinkability score.
WESTERN HILLS WATER DISTRICT/DIABLO GRAN has 8 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. 2 distinct EPA contaminant codes appear in this system's record, including TTHM, Surface Water Treatment Rule. Recorded violations span 2006–2017. 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)
- CA5010039
- System Type
- CWS
- Water Source
- Surface Water
- Location
- Patterson, CA
- Population Served
- 2,000
- Health Violations
- Yes (8)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| TTHM | 7 | 7 |
| Surface Water Treatment Rule | 1 | 1 |
Violation History (8)
Frequently Asked Questions
What does EPA SDWIS list for WESTERN HILLS WATER DISTRICT/DIABLO GRAN?
How many people does WESTERN HILLS WATER DISTRICT/DIABLO GRAN serve?
What violations does WESTERN HILLS WATER DISTRICT/DIABLO GRAN have?
What contaminants have been found in WESTERN HILLS WATER DISTRICT/DIABLO GRAN water?
Compare beyond California
Nationwide peers by violations & population served
Cross-state SDWIS systems nearest WESTERN HILLS WATER DISTRICT/DIABLO GRAN on cumulative violation count (8) and EPA-reported population served (2,000). Violation-count peers include Mashantucket Pequot Water System, San Ildefonso Pueblo, TOWAOC WATER SYSTEM. Population peers include ROCKY BOY'S RURAL WATER, ADC - TUCKER UNIT MAINT, DIAMOND VALLEY WATER DISTRICT.
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
WESTERN HILLS WATER DISTRICT/DIABLO GRAN (CA5010039) is drawn from EPA SDWIS. Nearby county systems in this extract include MODESTO, CITY OF; TURLOCK, CITY OF; CERES, CITY OF; PATTERSON, CITY OF. Health-based rows (8 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.