HOLLISTER, CITY OF
PWSID: CA3510001 · Hollister, CA · Serves 26,017 people
HOLLISTER, CITY OF has 17 health-based violations out of 17 total. Health violations indicate contaminant levels exceeded EPA limits or required treatment was not followed.
HOLLISTER, CITY OF (PWSID CA3510001) is a cws water system drawing from a surface water source, regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act. It serves approximately 26,017 people in Hollister, CA, and is subject to primacy enforcement by the California drinking-water program.
The system's federal compliance record contains 17 total violations, with 17 classified as health-based (MCL exceedances or treatment-technique failures). 1 distinct contaminant has been cited, including Total Trihalomethanes (TTHM). Recorded violations span 2015–2022.
A historical violation does not necessarily describe current water quality, systems must notify customers and remediate, and monitoring-type violations often reflect reporting lapses rather than contamination. The most authoritative real-time 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)
- CA3510001
- System Type
- CWS
- Water Source
- Surface Water
- Location
- Hollister, CA
- Population Served
- 26,017
- Health Violations
- Yes (17)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| Total Trihalomethanes (TTHM) | 17 | 17 |
Violation History (17)
| Contaminant | Health | Date |
|---|---|---|
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2022 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2022 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2022 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2022 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2022 |
| Total Trihalomethanes (TTHM) | Yes | Oct 1, 2018 |
| Total Trihalomethanes (TTHM) | Yes | Oct 1, 2018 |
| Total Trihalomethanes (TTHM) | Yes | Oct 1, 2018 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2018 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2018 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2018 |
| Total Trihalomethanes (TTHM) | Yes | Jan 1, 2016 |
| Total Trihalomethanes (TTHM) | Yes | Jan 1, 2016 |
| Total Trihalomethanes (TTHM) | Yes | Jan 1, 2016 |
| Total Trihalomethanes (TTHM) | Yes | Oct 1, 2015 |
| Total Trihalomethanes (TTHM) | Yes | Oct 1, 2015 |
| Total Trihalomethanes (TTHM) | Yes | Oct 1, 2015 |
Frequently Asked Questions
Is HOLLISTER, CITY OF water safe to drink?
How many people does HOLLISTER, CITY OF serve?
What violations does HOLLISTER, CITY OF have?
What contaminants have been found in HOLLISTER, CITY OF water?
Nearby Water Systems
Explore More
About This Data
Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Violation records may span multiple years.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.