Public water system · CA4910007
ActiveSea Ranch Water Company,the (Puc)
At a glance
Sea Ranch Water Company,the (Puc) (PWSID CA4910007) is an active community water system in Sonoma County, California. It reports serving 1,160 people through 1,943 service connections. Its primary water source is surface water, and EPA lists it as privately owned. EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in October 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,160
Service connections
1,943
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Sea Ranch Water Company,the (Puc) compare with other water systems in Sonoma County?
By EPA's size categories, Sea Ranch Water Company,the (Puc) is a small system (501 to 3,300 people). Sonoma County has 441 active public water systems. Its population served is roughly in line with the county average of 1,092 people per system, and accounts for 0.2% of the 481,435 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 Sea Ranch Water Company,the (Puc) 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 609 California systems (8.1%) list surface water as their primary source.
Who owns and regulates Sea Ranch Water Company,the (Puc)?
EPA lists Sea Ranch Water Company,the (Puc) as privately owned. 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. 371 of the 441 active systems in Sonoma County (84%) are also privately owned.
Does Sea Ranch Water Company,the (Puc) have drinking water violations?
EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in October 2024. The violations listed here began between June 1993 and October 2024. By type: 4 required treatment not met, 1 reporting, 1 monitoring and reporting and 1 monitoring. The contaminant or rule involved most often is Lead and Copper Rule Revisions (2 of them). EPA lists 5 as resolved and 2 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 |
|---|---|---|---|---|
| 2024-10-17 | Required treatment not metLSL Inventory · code 2E | Lead and Copper Rule Revisionscode 5200 | Yes | Unaddressed |
| 2024-10-17 | ReportingLSL Reporting · code 4G | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2024-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2023-09-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2007-06-01 | Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 1999-06-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1993-06-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
All 7 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.
Sea Ranch Water Company,the (Puc): frequently asked questions
Who runs Sea Ranch Water Company,the (Puc)?
Sea Ranch Water Company,the (Puc) (PWSID CA4910007) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Sea Ranch Water Company,the (Puc) serve?
Sea Ranch Water Company,the (Puc) reports serving 1,160 people through 1,943 service connections in Sonoma County, California.
Where does Sea Ranch Water Company,the (Puc) get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Sea Ranch Water Company,the (Puc) have any drinking water violations?
EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in October 2024. 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 Sea Ranch Water Company,the (Puc)'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 7 violations for this system; 4 are health-based, and the most recent began in October 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Sea Ranch Water Company,the (Puc)'s water quality report?
As a community water system, Sea Ranch Water Company,the (Puc) 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 Sonoma County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Santa Rosa, City of | Sonoma | 175,396 | Community | Groundwater |
| Petaluma, City of | Sonoma | 60,781 | Community | Groundwater |
| Rohnert Park, City of | Sonoma | 43,821 | Community | Groundwater |
| Windsor, Town of | Sonoma | 25,561 | Community | Groundwater |
| Valley of the Moon Water District | Sonoma | 23,107 | Community | Groundwater |
| Sonoma, City of | Sonoma | 11,725 | 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, “Sea Ranch Water Company,the (Puc), PWSID CA4910007, California”, https://aquacensus.com/water-systems/california/sea-ranch-water-company-the-puc-ca4910007 (data as of October 1, 2026).