Public water system · CA0610003
ActiveMaxwell Public Utility District
At a glance
Maxwell Public Utility District (PWSID CA0610003) is an active community water system in Colusa County, California. It reports serving 1,175 people through 393 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,175
Service connections
393
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Maxwell Public Utility District compare with other water systems in Colusa County?
By EPA's size categories, Maxwell Public Utility District is a small system (501 to 3,300 people). Colusa County has 29 active public water systems, and Maxwell Public Utility District is the 5th-largest of them by population served. Its population served is roughly in line with the county average of 1,211 people per system, and accounts for 3.3% of the 35,121 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 Maxwell 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 Maxwell Public Utility District?
EPA lists Maxwell 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. 7 of the 29 active systems in Colusa County (24%) are also owned by a local government.
Does Maxwell Public Utility District have drinking water violations?
EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in July 2025. The violations listed here began between October 1992 and July 2025. By type: 2 monitoring and reporting, 1 reporting, 1 monitoring and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 4 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2019-02-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 1993-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1992-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 5 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.
Maxwell Public Utility District: frequently asked questions
Who runs Maxwell Public Utility District?
Maxwell Public Utility District (PWSID CA0610003) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Maxwell Public Utility District serve?
Maxwell Public Utility District reports serving 1,175 people through 393 service connections in Colusa County, California.
Where does Maxwell 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 Maxwell Public Utility District have any drinking water violations?
EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in July 2025. 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 Maxwell 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. EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Maxwell Public Utility District's water quality report?
As a community water system, Maxwell 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 Colusa County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Caltrans-Maxwell Reststops | Colusa | 15,000 | Transient non-community | Groundwater |
| City of Colusa | Colusa | 6,447 | Community | Groundwater |
| City of Williams | Colusa | 5,538 | Community | Groundwater |
| Arbuckle Public Utility District | Colusa | 2,778 | Community | Groundwater |
| Colusa Industrial Properties | Colusa | 533 | Non-transient non-community | Groundwater |
| Menf-Fouts Springs Cg | Colusa | 531 | Transient non-community | Groundwater |
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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, “Maxwell Public Utility District, PWSID CA0610003, California”, https://aquacensus.com/water-systems/california/maxwell-public-utility-district-ca0610003 (data as of October 1, 2026).