Public water system · CA2310010
ActiveHopland Public Utility District
At a glance
Hopland Public Utility District (PWSID CA2310010) is an active community water system in Mendocino County, California. It reports serving 1,076 people through 347 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in September 2008.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,076
Service connections
347
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Hopland Public Utility District compare with other water systems in Mendocino County?
By EPA's size categories, Hopland Public Utility District is a small system (501 to 3,300 people). Mendocino County has 144 active public water systems. Its population served is about 87% above the county average of 576 people per system, and accounts for 1.3% of the 82,868 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active community water system reports serving 6,703 people, so Hopland Public Utility District is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. California has 2,997 active community water systems, 40% of the state's 7,479 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,179 California systems (83%) list groundwater as their primary source.
Who owns and regulates Hopland Public Utility District?
EPA lists Hopland Public Utility District as owned by a local government. The CA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 26 of the 144 active systems in Mendocino County (18%) are also owned by a local government.
Does Hopland Public Utility District have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in September 2008. The violations listed here began between June 2001 and September 2008. By type: 7 monitoring and reporting and 5 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2008-09-01 | Public notice, recordkeeping or otherVariance/Exemption/Other Compliance · code 08 | Not reported | No | Resolved |
| 2007-01-01 | Public notice, recordkeeping or otherVariance/Exemption/Other Compliance · code 08 | Not reported | No | Resolved |
| 2005-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2005-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2005-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2004-11-19 | Public notice, recordkeeping or otherVariance/Exemption/Other Compliance · code 08 | Not reported | No | Resolved |
| 2004-11-01 | Public notice, recordkeeping or otherPublic Notification Violation without NPDWR Violation · code 76 | Public Noticecode 7500 | No | Resolved |
| 2004-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2004-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2001-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2001-06-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Hopland Public Utility District: frequently asked questions
Who runs Hopland Public Utility District?
Hopland Public Utility District (PWSID CA2310010) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Hopland Public Utility District serve?
Hopland Public Utility District reports serving 1,076 people through 347 service connections in Mendocino County, California.
Where does Hopland Public Utility District get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Hopland Public Utility District have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in September 2008. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Hopland Public Utility District's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in September 2008. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Hopland Public Utility District's water quality report?
As a community water system, Hopland Public Utility District must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Mendocino County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Ukiah, City of | Mendocino | 16,607 | Community | Surface water |
| Fort Bragg, City of | Mendocino | 6,919 | Community | Surface water |
| Willits, City of | Mendocino | 6,175 | Community | Surface water |
| Millview County Water District | Mendocino | 5,500 | Community | Surface water |
| Redwood Valley County Water District | Mendocino | 5,200 | Community | Surface water |
| Willow County Water District | Mendocino | 3,797 | Community | Purchased surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Hopland Public Utility District, PWSID CA2310010, California”, https://aquacensus.com/water-systems/california/hopland-public-utility-district-ca2310010 (data as of October 1, 2026).