Public water system · CA0707547
ActiveKnightsen Community Water System
At a glance
Knightsen Community Water System (PWSID CA0707547) is an active community water system in Contra Costa County, California. It reports serving 73 people through 22 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
73
Service connections
22
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Knightsen Community Water System compare with other water systems in Contra Costa County?
By EPA's size categories, Knightsen Community Water System is a very small system (500 people or fewer). Contra Costa County has 84 active public water systems. Its population served is well below the county average of 6,726 people per system, and accounts for less than 0.1% 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 Knightsen Community Water System 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 Knightsen Community Water System?
EPA lists Knightsen Community Water System 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 Knightsen Community Water System have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Knightsen Community Water System. For the latest compliance status, check EPA ECHO for current compliance history.
Knightsen Community Water System: frequently asked questions
Who runs Knightsen Community Water System?
Knightsen Community Water System (PWSID CA0707547) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Knightsen Community Water System serve?
Knightsen Community Water System reports serving 73 people through 22 service connections in Contra Costa County, California.
Where does Knightsen Community Water System 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 Knightsen Community Water System have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Knightsen Community Water System'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 Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Knightsen Community Water System's water quality report?
As a community water system, Knightsen Community Water System 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 |
| City of Martinez | Contra Costa | 30,997 | 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, “Knightsen Community Water System, PWSID CA0707547, California”, https://aquacensus.com/water-systems/california/knightsen-community-water-system-ca0707547 (data as of October 1, 2026).