PlainWater
States → California

Transient Non-Community Water System · PWS CA4100527

Csp - Portola State Park

Felton, California 95018 - drinking water served from surface water sources to 181 people, tracked in EPA SDWIS and UCMR5.

181
People served
32
EPA violations
4
Health-based
Untested
UCMR5 result

The verdict

EPA records 32 drinking-water violations at Csp - Portola State Park, 13% of them health-based - above the California per-system average.

32
Total EPA violations on record
13%
Health-based (MCL / treatment failure)
181
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Csp - Portola State Park

Csp - Portola State Park is a state-owned transient non-community water system that delivers drinking water to 181 residents in Felton, California (San Mateo County) through 44 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 32 total violations for this system , of which 4 (13%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 4 monitoring and reporting violations are on file. The most recent violation on record dates to 2008.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 2 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across California, EPA tracks 7,249 public water systems serving 42,404,883 people, with 153,308 cumulative violations and 63,983 health-based violations on record. About 89% of systems in the state carry at least one violation, and state-wide the average per system is 21.1 violations. Statewide, 447 of 694 UCMR5-tested systems have reported PFAS detections (64.4%).

Csp - Portola State Park's 32 violations sit above the California average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
181
Total Violations
32
Health-Based Violations
4
Water Source
Surface Water

System Details

System Type
Transient Non-Community
Owner Type
State
Connections
44
County
San Mateo
School/Daycare
No
MCL Violations
2
Monitoring Violations
4
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule MR 2 1999
Coliform (TCR) MCL 2 2002
Coliform (TCR) MR 2 2007
Surface Water Treatment Rule TT 2 2008

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Csp - Portola State Park.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID CA4100527 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

California Drinking Water Authority

California State Water Resources Control Board, Division of Drinking Water is the primacy agency that licenses and inspects Csp - Portola State Park under EPA-delegated authority.

Open CA regulator portal

Source: California State Water Resources Control Board, Division of Drinking Water

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2008 Surface Water Treatment Rule TT 2 SDWIS / CA4100527 / 0200
2007 Coliform (TCR) MR 2 SDWIS / CA4100527 / 3100
2002 Coliform (TCR) MCL 2 SDWIS / CA4100527 / 3100
1999 Surface Water Treatment Rule MR 2 SDWIS / CA4100527 / 0200

How Csp - Portola State Park Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Csp - Portola State Park California avg Federal benchmark
Total violations 32 21.1 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 8.8 Indicates a contaminant exceeded a federal MCL
PFAS detection None 64.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 181 5,850 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 7,249 regulated public water systems in California.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Csp - Portola State Park water safe to drink? ▼
Csp - Portola State Park (PWS ID: CA4100527) has 32 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 181 people using Surface Water sources.
How many people does Csp - Portola State Park serve? ▼
Csp - Portola State Park serves 181 people in Felton, California. It is a State-owned system using Surface Water water sources with 44 service connections.
What type of violations does Csp - Portola State Park have? ▼
Csp - Portola State Park has 32 total violations: 4 health-based violations (MCL exceedances or treatment failures), 4 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Csp - Portola State Park water? ▼
No PFAS testing data is available for Csp - Portola State Park under the EPA's UCMR5 monitoring program.
What water source does Csp - Portola State Park use? ▼
Csp - Portola State Park uses Surface Water as its primary water source. It is classified as a Transient Non-Community Water System, serving transient populations.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.