Public water system · CA0710006
ActiveCity of Martinez
At a glance
City of Martinez (PWSID CA0710006) is an active community water system in Contra Costa County, California. It reports serving 30,997 people through 10,230 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 2015.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
30,997
Service connections
10,230
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does City of Martinez compare with other water systems in Contra Costa County?
By EPA's size categories, City of Martinez is a large system (10,001 to 100,000 people). Contra Costa County has 84 active public water systems, and City of Martinez is the 6th-largest of them by population served. Its population served is about 4.6 times the county average of 6,726 people per system, and accounts for 5.5% of the 564,952 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 City of Martinez is about 4.6 times 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. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 506 California systems (6.8%) list purchased surface water as their primary source.
Who owns and regulates City of Martinez?
EPA lists City of Martinez 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. 25 of the 84 active systems in Contra Costa County (30%) are also owned by a local government.
Does City of Martinez have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 2015. The violations listed here began between June 1993 and October 2015. By type: 2 monitoring and reporting. The contaminant or rule involved most often is Lead and Copper Rule (2 of them). EPA lists 2 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 |
|---|---|---|---|---|
| 2015-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1993-06-30 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
All 2 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.
City of Martinez: frequently asked questions
Who runs City of Martinez?
City of Martinez (PWSID CA0710006) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does City of Martinez serve?
City of Martinez reports serving 30,997 people through 10,230 service connections in Contra Costa County, California.
Where does City of Martinez get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does City of Martinez have any drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 2015. 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 City of Martinez'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 2 violations for this system; none is health-based, and the most recent began in October 2015. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find City of Martinez's water quality report?
As a community water system, City of Martinez 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 Contra Costa County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Contra Costa Water District | Contra Costa | 198,000 | Community | Surface water |
| City of Antioch | Contra Costa | 115,074 | Community | Surface water |
| Brentwood | Contra Costa | 64,513 | Community | Purchased surface water |
| City of Pittsburg | Contra Costa | 62,500 | Community | Purchased surface water |
| Diablo Water District | Contra Costa | 43,357 | Community | Purchased surface water |
| Golden State Water Company - Bay Point | Contra Costa | 23,731 | 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, “City of Martinez, PWSID CA0710006, California”, https://aquacensus.com/water-systems/california/city-of-martinez-ca0710006 (data as of October 1, 2026).