Public water system · CA2110350

Active

Nps Ggnra

At a glance

Nps Ggnra (PWSID CA2110350) is an active community water system in Marin County, California. It reports serving 18,447 people through 224 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by the federal government. EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in October 2015.

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

Population served

18,447

Service connections

224

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDCA2110350

System typeCommunity water system

Activity statusActive

Population served18,447

Service connections224

Primary water sourcePurchased surface water

Owner typeFederal government

Primacy agencyCA state drinking water program

City served—

StateCalifornia

ZIP—

CountyMarin County

How does Nps Ggnra compare with other water systems in Marin County?

By EPA's size categories, Nps Ggnra is a large system (10,001 to 100,000 people). Marin County has 46 active public water systems, and Nps Ggnra is the 3rd-largest of them by population served. Its population served is about 197% above the county average of 6,203 people per system, and accounts for 6.5% 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 Nps Ggnra is about 175% above 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 Nps Ggnra?

EPA lists Nps Ggnra as owned by the federal 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. 6 of the 46 active systems in Marin County (13%) are also owned by the federal government.

Does Nps Ggnra have drinking water violations?

EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in October 2015. The violations listed here began between February 1999 and October 2015. By type: 6 monitoring and reporting, 2 required treatment not met and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 10 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	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
2015-09-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
2015-09-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2007-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2007-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2006-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2006-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2002-01-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2001-12-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
1999-02-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved

All 10 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.

Nps Ggnra: frequently asked questions

Who runs Nps Ggnra?

Nps Ggnra (PWSID CA2110350) is a community water system owned by the federal government. It is regulated by the CA state drinking water program.

How many people does Nps Ggnra serve?

Nps Ggnra reports serving 18,447 people through 224 service connections in Marin County, California.

Where does Nps Ggnra 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 Nps Ggnra have any drinking water violations?

EPA's records list 10 violations for this system; 4 are 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 Nps Ggnra'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 10 violations for this system; 4 are 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 Nps Ggnra's water quality report?

As a community water system, Nps Ggnra 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
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
Nps Prns - Beaches	Marin	1,560	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, “Nps Ggnra, PWSID CA2110350, California”, https://aquacensus.com/water-systems/california/nps-ggnra-ca2110350 (data as of October 1, 2026).