Public water system · CA2110007

Active

Coast Springs - Cal. Water Service (Puc)

At a glance

Coast Springs - Cal. Water Service (Puc) (PWSID CA2110007) is an active community water system in Marin County, California. It reports serving 388 people through 251 service connections. Its primary water source is surface water, and EPA lists it as privately owned. EPA's records list 11 violations for this system; 5 are health-based, and the most recent began in October 2007.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

388

Service connections

251

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDCA2110007

System typeCommunity water system

Activity statusActive

Population served388

Service connections251

Primary water sourceSurface water

Owner typePrivate

Primacy agencyCA state drinking water program

City served—

StateCalifornia

ZIP—

CountyMarin County

How does Coast Springs - Cal. Water Service (Puc) compare with other water systems in Marin County?

By EPA's size categories, Coast Springs - Cal. Water Service (Puc) is a very small system (500 people or fewer). Marin County has 46 active public water systems. Its population served is well below the county average of 6,203 people per system, and accounts for 0.1% of the 285,353 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 Coast Springs - Cal. Water Service (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 Coast Springs - Cal. Water Service (Puc)?

EPA lists Coast Springs - Cal. Water Service (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. 22 of the 46 active systems in Marin County (48%) are also privately owned.

Does Coast Springs - Cal. Water Service (Puc) have drinking water violations?

EPA's records list 11 violations for this system; 5 are health-based, and the most recent began in October 2007. The violations listed here began between November 1983 and October 2007. By type: 5 monitoring and reporting, 5 required treatment not met and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Surface Water Treatment Rule (5 of them). EPA lists 10 as resolved and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.

Began	Violation	Contaminant or rule	Health-based	Status
2007-10-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2006-01-01	Monitoring and reportingMonitoring, Regular · code 03	Benzenecode 2990	No	Resolved
1999-03-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
1998-12-01	Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26	Total coliform bacteria (TCR)code 3100	No	Resolved
1997-11-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
1997-07-01	Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26	Total coliform bacteria (TCR)code 3100	No	Resolved
1996-02-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
1995-01-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
1994-08-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
1993-07-01	Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51	Lead and Copper Rulecode 5000	No	Resolved
1983-11-01	Public notice, recordkeeping or otherNotification, Public · code 06	Not reported	No	Archived

All 11 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.

Coast Springs - Cal. Water Service (Puc): frequently asked questions

Who runs Coast Springs - Cal. Water Service (Puc)?

Coast Springs - Cal. Water Service (Puc) (PWSID CA2110007) is a community water system privately owned. It is regulated by the CA state drinking water program.

How many people does Coast Springs - Cal. Water Service (Puc) serve?

Coast Springs - Cal. Water Service (Puc) reports serving 388 people through 251 service connections in Marin County, California.

Where does Coast Springs - Cal. Water Service (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 Coast Springs - Cal. Water Service (Puc) have any drinking water violations?

EPA's records list 11 violations for this system; 5 are health-based, and the most recent began in October 2007. 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 Coast Springs - Cal. Water Service (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 11 violations for this system; 5 are health-based, and the most recent began in October 2007. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.

Where can I find Coast Springs - Cal. Water Service (Puc)'s water quality report?

As a community water system, Coast Springs - Cal. Water Service (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 Marin County

Water system	County	Population served	Type	Source
Marin Municipal Water District	Marin	186,895	Community	Surface water
North Marin Water District	Marin	61,691	Community	Surface water
Nps Ggnra	Marin	18,447	Community	Purchased surface water
Bolinas Community PUD	Marin	2,483	Community	Surface water
North Marin Wd - Pt. Reyes	Marin	1,841	Community	Groundwater
Csp - Angel Island St Park	Marin	1,622	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, “Coast Springs - Cal. Water Service (Puc), PWSID CA2110007, California”, https://aquacensus.com/water-systems/california/coast-springs-cal-water-service-puc-ca2110007 (data as of October 1, 2026).