Drinking water quality · 2024
· Verified
What's in Golden State Water Company, CA tap water
15 contaminants were measured in the Golden State Water Company, CA water system's 2024 annual report. Each is shown below against its federal limit — 2 sit at or above that limit.
- Reporting year
- 2024
- Contaminants measured
- 15
- Over federal limit
- 2
- Approaching the limit
- 1
- Worst contaminant
- Chromium, Hexavalent
- Service area
- CA
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound approaching EPA limits in Golden State Water Company, CA
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
PFHxS (Perfluorohexane sulfonic acid)
● Approaching limit (88%)near national p90 (12.049999999999997 ng/L across detecting U.S. systems)
PFPeA
● Detected (no federal limit)below national p90 (15.95999999999999 ng/L across detecting U.S. systems)
PFHxA
● Detected (no federal limit)below national p90 (12.190000000000003 ng/L across detecting U.S. systems)
Lithium
● Detected (no federal limit)below national p90 (76.59999999999991 mg/L across detecting U.S. systems)
PFBS
● Detected (no federal limit)below national p90 (13.909999999999979 ng/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
Golden State Water Company, CA's drinking water comes from ground water, drawn from 6 sources.
Source
- LOS OLIVOS · 2
- CABRILLO WELL
- SOUTH BAY
- ROSINA WELL
- + 1 more
Treatment
- LOS OLIVOS RESV NITRATE BLEND INFLUENT
- SOUTH BAY WELL 01 - TRT CL
- ROSINA WELL - TRT CL
- + 6 more
Distribution
Historical readings · EPA Six-Year Review (2012–2019)
2 contaminants historically over EPA limits in Golden State Water Company, CA
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
NITRATE worst: 2017 | 24 mg/L 2.4× | 10 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE NITRITE worst: 2017 | 21 mg/L 2.1× | 10 mg/L | '17'18 |
CHROMIUM worst: 2015 | 0.015 mg/L within above national p90 | 0.1 mg/L | '15 |
RADIUM 226 228 worst: 2018 | 0.62 pCi/L within below national p90 | 5 pCi/L | '18 |
DICHLOROMETHANE worst: 2017 | 0.0005 mg/L within | 0.005 mg/L | '17 |
HAA5 worst: 2014 | 0.0046 mg/L within | 0.06 mg/L | '14 |
BARIUM worst: 2016 | 0.14 mg/L within near national p90 | 2 mg/L | '12'15'16'19 |
FLUORIDE worst: 2012 | 0.25 mg/L within | 4 mg/L | '12'15'16'18'19 |
TTHM worst: 2016 | 0.0028 mg/L within | 0.08 mg/L | '16'19 |
MCAA worst: 2014 | 0.0046 mg/L | — | '14 |
BROMOFORM worst: 2016 | 0.0013 mg/L | — | '16 |
DIBROMOCHLOROMETHANE worst: 2016 | 0.0015 mg/L | — | '16'19 |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 0.11 ug/LAverageSystem-wide | 0.02 ug/LMCLG | At or above the limit |
| CopperA metal that enters water from corroding household plumbing. | 0.15 mg/L90th percentileAt the tap | 0.3 mg/LMCLG | Within the limit |
| AluminumA common element sometimes used as a treatment coagulant. | 0.06 mg/LAverageSystem-wide | 0.6 mg/LMCLG | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | Not detected ug/L90th percentileAt the tap | 0.2 ug/LMCLG | None detected |
Disinfection byproducts
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChloramineA longer-lasting disinfectant made by combining chlorine with ammonia. | 2.6 mg/LRunning annual avgHighest Quarterly | 4 mg/LMCLG | Within the limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0.5 %AverageSystem-wide | 5 %MCL | Within the limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.44 NTURangeSystem-wide | 95 NTUMCL | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Asbestos | Not detected MFLAverageSystem-wide | 7 MFLMCLG | Within the limit |
People also ask about Golden State Water Company, CA's water
+Is Golden State Water Company, CA tap water safe to drink in 2024?
The 2024 Consumer Confidence Report for the Golden State Water Company, CA water utility lists 2 contaminants at or above the federal limit: Chromium, Hexavalent and Chlorite. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Golden State Water Company, CA tap water?
15 contaminants were measured in Golden State Water Company, CA's 2024 Consumer Confidence Report, spanning metals, disinfection byproducts, and inorganic chemicals. 14 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Golden State Water Company, CA tap water?
2 contaminants in Golden State Water Company, CA's 2024 report sit at or above the federal limit: Chromium, Hexavalent (5.5× the limit); Chlorite (4.0× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Golden State Water Company, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2024 report is Chromium, Hexavalent, at 5.5× the federal threshold. It belongs to the metals family of contaminants.
+Are any contaminants in Golden State Water Company, CA tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: Fluoride. Approaching means measured but not in violation — a margin that can close quickly if conditions change.
+Where does the data on this page come from?
Every value is transcribed from Golden State Water Company, CA's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Golden State Water Company, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2024 report; a new report will replace it once the utility publishes its next annual update.