PlainWater
States → California

Community Water System · PWS CA4010040

Golden State Water Company-Cypress Ridge

Rancho Cordova, California 95670 - drinking water served from groundwater sources to 2,026 people, tracked in EPA SDWIS and UCMR5.

2,026
People served
48
EPA violations
4
Health-based
Untested
UCMR5 result

The verdict

EPA records 48 drinking-water violations at Golden State Water Company-Cypress Ridge, 8% of them health-based - above the California per-system average.

48
Total EPA violations on record
8%
Health-based (MCL / treatment failure)
2,026
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Golden State Water Company-Cypress Ridge

Golden State Water Company-Cypress Ridge is a private-owned community water system that delivers drinking water to 2,026 residents in Rancho Cordova, California (San Luis Obispo County) through 966 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 48 total violations for this system , of which 4 (8%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 39 monitoring and reporting violations are on file. The most recent violation on record dates to 2013.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 6 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%).

Golden State Water Company-Cypress Ridge's 48 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
2,026
Total Violations
48
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
966
County
San Luis Obispo
School/Daycare
No
MCL Violations
4
Monitoring Violations
39
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 6 2011
Lead and Copper Rule MR 5 2008
Nitrite MR 4 2002
Nitrate Other 2 2011
Public Notice Other 2 2011
Arsenic MR 2 2000
Barium MR 2 2000
Beryllium, Total MR 2 2000
Cadmium MR 2 2000
Fluoride MR 2 2000
Nickel MR 2 2000
Selenium MR 2 2000
Thallium, Total MR 2 2000
Mercury MR 2 2000
Nitrate MCL 2 2013
Nitrate-Nitrite MCL 2 2010
Nitrate MR 2 2011
Chromium MR 2 2000
Antimony, Total MR 2 2000

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 Golden State Water Company-Cypress Ridge.

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 CA4010040 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 Golden State Water Company-Cypress Ridge 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
2013 Nitrate MCL 2 SDWIS / CA4010040 / 1040
2011 Coliform (TCR) MR 6 SDWIS / CA4010040 / 3100
2011 Nitrate Other 2 SDWIS / CA4010040 / 1040
2011 Public Notice Other 2 SDWIS / CA4010040 / 7500
2011 Nitrate MR 2 SDWIS / CA4010040 / 1040
2010 Nitrate-Nitrite MCL 2 SDWIS / CA4010040 / 1038
2008 Lead and Copper Rule MR 5 SDWIS / CA4010040 / 5000
2002 Nitrite MR 4 SDWIS / CA4010040 / 1041
2000 Arsenic MR 2 SDWIS / CA4010040 / 1005
2000 Barium MR 2 SDWIS / CA4010040 / 1010
2000 Beryllium, Total MR 2 SDWIS / CA4010040 / 1075
2000 Cadmium MR 2 SDWIS / CA4010040 / 1015
2000 Fluoride MR 2 SDWIS / CA4010040 / 1025
2000 Nickel MR 2 SDWIS / CA4010040 / 1036
2000 Selenium MR 2 SDWIS / CA4010040 / 1045

How Golden State Water Company-Cypress Ridge Compares

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

Metric Golden State Water Company-Cypress Ridge California avg Federal benchmark
Total violations 48 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 2,026 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 Golden State Water Company-Cypress Ridge water safe to drink? ▼
Golden State Water Company-Cypress Ridge (PWS ID: CA4010040) has 48 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,026 people using Groundwater sources.
How many people does Golden State Water Company-Cypress Ridge serve? ▼
Golden State Water Company-Cypress Ridge serves 2,026 people in Rancho Cordova, California. It is a Private-owned system using Groundwater water sources with 966 service connections.
What type of violations does Golden State Water Company-Cypress Ridge have? ▼
Golden State Water Company-Cypress Ridge has 48 total violations: 4 health-based violations (MCL exceedances or treatment failures), 39 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Golden State Water Company-Cypress Ridge water? ▼
No PFAS testing data is available for Golden State Water Company-Cypress Ridge under the EPA's UCMR5 monitoring program.
What water source does Golden State Water Company-Cypress Ridge use? ▼
Golden State Water Company-Cypress Ridge uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
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.