Public water system · CA2110500
ActiveNps Prns - Lighthouse
At a glance
Nps Prns - Lighthouse (PWSID CA2110500) is an active transient non-community water system in Marin County, California. It reports serving 1,202 people through 2 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; 1 is health-based, and the most recent began in January 2019.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,202
Service connections
2
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Nps Prns - Lighthouse compare with other water systems in Marin County?
By EPA's size categories, Nps Prns - Lighthouse is a small system (501 to 3,300 people). 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 0.4% 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 - Lighthouse is about 8.4 times 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 - Lighthouse?
EPA lists Nps Prns - Lighthouse 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 - Lighthouse have drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in January 2019. The violations listed here began between January 1999 and January 2019. By type: 2 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Nitrate (2 of them). 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 |
| 2004-04-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1999-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | 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 - Lighthouse: frequently asked questions
Who runs Nps Prns - Lighthouse?
Nps Prns - Lighthouse (PWSID CA2110500) 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 - Lighthouse serve?
Nps Prns - Lighthouse reports serving 1,202 people through 2 service connections in Marin County, California.
Where does Nps Prns - Lighthouse 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 - Lighthouse have any drinking water violations?
EPA's records list 3 violations for this system; 1 is 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 - Lighthouse'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 3 violations for this system; 1 is 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 - Lighthouse's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Nps Prns - Lighthouse 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 - Lighthouse, PWSID CA2110500, California”, https://aquacensus.com/water-systems/california/nps-prns-lighthouse-ca2110500 (data as of October 1, 2026).