Public water system · CA2110010
ActiveNps Prns - Five Brooks
At a glance
Nps Prns - Five Brooks (PWSID CA2110010) is an active transient non-community water system in Marin County, California. It reports serving 365 people through 6 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. EPA's records list 3 violations for this system; 2 are health-based, and the most recent began in January 2019.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
365
Service connections
6
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Nps Prns - Five Brooks compare with other water systems in Marin County?
By EPA's size categories, Nps Prns - Five Brooks 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 transient non-community water system reports serving 144 people, so Nps Prns - Five Brooks is about 154% above that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. California has 3,016 active transient non-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 Nps Prns - Five Brooks?
EPA lists Nps Prns - Five Brooks 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 Prns - Five Brooks have drinking water violations?
EPA's records list 3 violations for this system; 2 are health-based, and the most recent began in January 2019. The violations listed here began between June 1997 and January 2019. By type: 1 monitoring and reporting, 1 contaminant level above the legal limit and 1 required treatment not met. The contaminants or rules involved are Nitrate, Total coliform bacteria (TCR) and Surface Water Treatment Rule. EPA lists 3 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 |
|---|---|---|---|---|
| 2019-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2000-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1997-06-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
All 3 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 Prns - Five Brooks: frequently asked questions
Who runs Nps Prns - Five Brooks?
Nps Prns - Five Brooks (PWSID CA2110010) is a transient non-community water system owned by the federal government. It is regulated by the CA state drinking water program.
How many people does Nps Prns - Five Brooks serve?
Nps Prns - Five Brooks reports serving 365 people through 6 service connections in Marin County, California.
Where does Nps Prns - Five Brooks 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 Nps Prns - Five Brooks have any drinking water violations?
EPA's records list 3 violations for this system; 2 are health-based, and the most recent began in January 2019. 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 Prns - Five Brooks' 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 3 violations for this system; 2 are health-based, and the most recent began in January 2019. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Nps Prns - Five Brooks' water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Nps Prns - Five Brooks is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
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, “Nps Prns - Five Brooks, PWSID CA2110010, California”, https://aquacensus.com/water-systems/california/nps-prns-five-brooks-ca2110010 (data as of October 1, 2026).