Public water system · CA4910309
ActiveCsp-Fort Ross State Park
At a glance
Csp-Fort Ross State Park (PWSID CA4910309) is an active transient non-community water system in Sonoma County, California. It reports serving 3,501 people through 28 service connections. Its primary water source is groundwater under influence of surface water, and EPA lists it as owned by a state government. EPA's records list 9 violations for this system; 8 are health-based, and the most recent began in January 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,501
Service connections
28
Primary source
GU
Groundwater under influence of surface water
System type
TNCWS
Transient non-community water system
System record
How does Csp-Fort Ross State Park compare with other water systems in Sonoma County?
By EPA's size categories, Csp-Fort Ross State Park is a medium system (3,301 to 10,000 people). Sonoma County has 441 active public water systems. Its population served is about 3.2 times the county average of 1,092 people per system, and accounts for 0.7% 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 transient non-community water system reports serving 144 people, so Csp-Fort Ross State Park is about 24 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 under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules. 105 California systems (1.4%) list groundwater under influence of surface water as their primary source.
Who owns and regulates Csp-Fort Ross State Park?
EPA lists Csp-Fort Ross State Park as owned by a state 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. 10 of the 441 active systems in Sonoma County (2.3%) are also owned by a state government.
Does Csp-Fort Ross State Park have drinking water violations?
EPA's records list 9 violations for this system; 8 are health-based, and the most recent began in January 2021. The violations listed here began between June 1993 and January 2021. By type: 6 contaminant level above the legal limit, 2 required treatment not met and 1 monitoring. The contaminant or rule involved most often is Arsenic (6 of them). EPA lists 8 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 |
|---|---|---|---|---|
| 2021-01-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Archived |
| 2018-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2018-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2018-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2017-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2017-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2017-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 1995-09-01 | 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 9 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.
Csp-Fort Ross State Park: frequently asked questions
Who runs Csp-Fort Ross State Park?
Csp-Fort Ross State Park (PWSID CA4910309) is a transient non-community water system owned by a state government. It is regulated by the CA state drinking water program.
How many people does Csp-Fort Ross State Park serve?
Csp-Fort Ross State Park reports serving 3,501 people through 28 service connections in Sonoma County, California.
Where does Csp-Fort Ross State Park get its water?
EPA SDWIS lists this system's primary water source as groundwater under influence of surface water. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules.
Does Csp-Fort Ross State Park have any drinking water violations?
EPA's records list 9 violations for this system; 8 are health-based, and the most recent began in January 2021. 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 Csp-Fort Ross State Park'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 9 violations for this system; 8 are health-based, and the most recent began in January 2021. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Csp-Fort Ross State Park's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Csp-Fort Ross State Park 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 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, “Csp-Fort Ross State Park, PWSID CA4910309, California”, https://aquacensus.com/water-systems/california/csp-fort-ross-state-park-ca4910309 (data as of October 1, 2026).