# Golden State Water Company - Los Osos, CA — Drinking Water Quality (2026)

> Contaminant levels for the Golden State Water Company - Los Osos, CA public water system from its 2026 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/golden-state-water-company-los-osos/2026
- JSON API: https://www.thewatermap.com/api/water/ca/golden-state-water-company-los-osos/2026
- Source: the utility's annual Consumer Confidence Report (CCR)
- Verification: transcribed by a model, cross-checked by a second model, approved before publishing
- Reporting year: 2026
- Contaminants measured: 60
- Contaminants with a federal limit: 39
- Contaminants at or above the federal limit: 1
- Part of The Water Map — https://www.thewatermap.com

## Contaminants measured

| Contaminant | Category | Measured level | Sampling context | Federal limit | Status |
|---|---|---|---|---|---|
| Chloride | Inorganic chemicals | 114.85 MG/L (Average) | Source water | 500 MG/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | 8.629090909090909 MG/L (Average) | Source water | 10 MG/L (MCL) | Approaching the limit |
| Chromium, Hexavalent | Metals | 9.149999999999999 UG/L (Average) | Source water | 10 UG/L (MCL) | Approaching the limit |
| Iron | Metals | 256.6666666666667 UG/L (Average) | Source water | 300 UG/L (MCL) | Approaching the limit |
| Manganese | Metals | 8 UG/L (Average) | Source water | 50 UG/L (MCL) | Within the limit |
| Silica | Metals | 31.5 MG/L (Average) | Source water | No federal limit | Detected — no federal limit |
| Carbon Tetrachloride | Other | Not detected UG/L (Highest single sample) | Source water | 0.5 UG/L (MCL) | None detected |
| Chlorobenzene | Other | Not detected UG/L (Highest single sample) | Source water | 70 UG/L (MCL) | None detected |
| Cis Dichloroethylene 12 | Other | Not detected UG/L (Highest single sample) | Source water | 6 UG/L (MCL) | None detected |
| Deha | Other | Not detected UG/L (Highest single sample) | Source water | 400 UG/L (MCL) | None detected |
| Dehp | Other | Not detected UG/L (Highest single sample) | Source water | 4 UG/L (MCL) | None detected |
| Dichloroethane 12 | Other | Not detected UG/L (Highest single sample) | Source water | 0.5 UG/L (MCL) | None detected |
| Dichloroethylene 11 | Other | Not detected UG/L (Highest single sample) | Source water | 6 UG/L (MCL) | None detected |
| Dichloropropane 12 | Other | Not detected UG/L (Highest single sample) | Source water | 5 UG/L (MCL) | None detected |
| Endrin | Other | Not detected UG/L (Highest single sample) | Source water | 2 UG/L (MCL) | None detected |
| Heptachlor | Other | Not detected UG/L (Highest single sample) | Source water | 0.01 UG/L (MCL) | None detected |
| Heptachlor Epoxide | Other | Not detected UG/L (Highest single sample) | Source water | 0.01 UG/L (MCL) | None detected |
| Hexachlorobenzene | Other | Not detected UG/L (Highest single sample) | Source water | 1 UG/L (MCL) | None detected |
| Hexachlorocyclopentadiene | Other | Not detected UG/L (Highest single sample) | Source water | 50 UG/L (MCL) | None detected |
| Methoxychlor | Other | Not detected UG/L (Highest single sample) | Source water | 30 UG/L (MCL) | None detected |
| O Dichlorobenzene | Other | Not detected UG/L (Highest single sample) | Source water | 600 UG/L (MCL) | None detected |
| P Dichlorobenzene | Other | Not detected UG/L (Highest single sample) | Source water | 5 UG/L (MCL) | None detected |
| Pce | Other | Not detected UG/L (Highest single sample) | Source water | 5 UG/L (MCL) | None detected |
| Styrene | Other | Not detected UG/L (Highest single sample) | Source water | 100 UG/L (MCL) | None detected |
| Tce | Other | Not detected UG/L (Highest single sample) | Source water | 5 UG/L (MCL) | None detected |
| Trans Dichloroethylene 12 | Other | Not detected UG/L (Highest single sample) | Source water | 10 UG/L (MCL) | None detected |
| Trichlorobenzene 124 | Other | Not detected UG/L (Highest single sample) | Source water | 5 UG/L (MCL) | None detected |
| Trichloroethane 111 | Other | Not detected UG/L (Highest single sample) | Source water | 200 UG/L (MCL) | None detected |
| Trichloroethane 112 | Other | Not detected UG/L (Highest single sample) | Source water | 5 UG/L (MCL) | None detected |
| Vinyl Chloride | Other | Not detected UG/L (Highest single sample) | Source water | 0.5 UG/L (MCL) | None detected |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Entry point | No federal limit | None detected |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| 4:2 Fluorotelomer sulfonic acid (4:2 FTS) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Entry point | No federal limit | None detected |
| 6:2 Fluorotelomer sulfonic acid (6:2 FTS) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Entry point | No federal limit | None detected |
| 8:2 Fluorotelomer sulfonic acid (8:2 FTS) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Entry point | No federal limit | None detected |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| Hexafluoropropylene oxide dimer acid | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Entry point | No federal limit | None detected |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Entry point | No federal limit | None detected |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Entry point | No federal limit | None detected |
| Perfluorodecanoic acid (PFDA) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Entry point | No federal limit | None detected |
| Perfluorododecanoic acid (PFDoA) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Entry point | No federal limit | None detected |
| Perfluoroheptanesulfonic acid (PFHpS) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Entry point | No federal limit | None detected |
| Perfluoroheptanoic acid | PFAS ("forever chemicals") | 1.5999999999999999 NG/L (Average) | Source water | No federal limit | Detected — no federal limit |
| Perfluorohexanoic acid | PFAS ("forever chemicals") | 4.4 NG/L (Average) | Entry point | No federal limit | Detected — no federal limit |
| Perfluorononanoic acid | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| Perfluoropentanesulfonic acid (PFPeS) | PFAS ("forever chemicals") | 2.066666666666667 NG/L (Average) | Source water | No federal limit | Detected — no federal limit |
| Perfluoropentanoic acid | PFAS ("forever chemicals") | 2.8333333333333335 NG/L (Average) | Source water | No federal limit | Detected — no federal limit |
| Perfluoroundecanoic acid (PFUnA) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| PFBA | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| Total Dissolved Solids | Physical & aggregate | 332.5 MG/L (Average) | Source water | 1000 MG/L (MCL) | Within the limit |
| Turbidity | Physical & aggregate | 9.35 NTU (Average) | Source water | 5 NTU (MCL) | At or above the limit |
| Atrazine | VOCs & pesticides | Not detected UG/L (Highest single sample) | Source water | 1 UG/L (MCL) | None detected |
| Benzene | VOCs & pesticides | Not detected UG/L (Highest single sample) | Source water | 1 UG/L (MCL) | None detected |
| Benzo(a)pyrene | VOCs & pesticides | Not detected UG/L (Highest single sample) | Source water | 0.2 UG/L (MCL) | None detected |
| Dichloromethane | VOCs & pesticides | Not detected UG/L (Highest single sample) | Source water | 5 UG/L (MCL) | None detected |
| Ethylbenzene | VOCs & pesticides | Not detected UG/L (Highest single sample) | Source water | 300 UG/L (MCL) | None detected |
| Simazine | VOCs & pesticides | Not detected UG/L (Highest single sample) | Source water | 4 UG/L (MCL) | None detected |
| Toluene | VOCs & pesticides | Not detected UG/L (Highest single sample) | Source water | 150 UG/L (MCL) | None detected |
| Xylenes | VOCs & pesticides | Not detected UG/L (Highest single sample) | Source water | 1750 UG/L (MCL) | None detected |

## What these contaminants are

- **Chloride** — A naturally occurring salt compound. Regulated only as a secondary (cosmetic) standard; high levels cause a salty taste and can corrode pipes.
- **Nitrate** — A compound from fertilizer runoff, septic systems, and erosion of natural deposits. Levels above the federal limit can cause 'blue baby syndrome,' a serious oxygen-transport condition in infants.
- **Chromium, Hexavalent** — Hexavalent chromium ('chromium-6') — the more toxic form of chromium. A known carcinogen by inhalation; regulated nationally only within the total-chromium limit, with stricter limits in some states.
- **Iron** — A naturally occurring metal common in groundwater. Regulated only as a secondary (cosmetic) standard; causes rusty color, staining, and metallic taste.
- **Manganese** — A naturally occurring metal from soil and rock. No enforceable federal limit; high levels stain fixtures and laundry and can affect taste, with a health advisory for infants.
- **Silica** — A naturally occurring compound from sand and rock. Not federally regulated for health; relevant mainly for industrial water use.
- **11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)** — 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid, a chlorinated PFAS compound. Monitored under EPA rules as part of broad PFAS surveillance.
- **4,8-Dioxa-3H-perfluorononanoic acid (ADONA)** — ADONA, a newer-generation PFAS replacement compound. Monitored under EPA rules as part of broad PFAS surveillance.
- **4:2 Fluorotelomer sulfonic acid (4:2 FTS)** — 4:2 fluorotelomer sulfonic acid, a PFAS-related compound. Monitored under EPA rules as part of broad PFAS surveillance.
- **6:2 Fluorotelomer sulfonic acid (6:2 FTS)** — 6:2 fluorotelomer sulfonic acid, a PFAS-related compound. Monitored under EPA rules as part of broad PFAS surveillance.
- **8:2 Fluorotelomer sulfonic acid (8:2 FTS)** — 8:2 fluorotelomer sulfonic acid, a PFAS-related compound. Monitored under EPA rules as part of broad PFAS surveillance.
- **9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS)** — 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid, a chlorinated PFAS compound. Monitored under EPA rules as part of broad PFAS surveillance.
- **Hexafluoropropylene oxide dimer acid** — HFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound. Regulated by the EPA at 10 parts per trillion and included in the PFAS Hazard Index.
- **Perfluoro-3-methoxypropanoic acid (PFMPA)** — Perfluoro-3-methoxypropanoic acid, a PFAS-related compound. Monitored under EPA rules as part of broad PFAS surveillance.
- **Perfluoro-4-methoxybutanoic acid (PFMBA)** — Perfluoro-4-methoxybutanoic acid, a PFAS-related compound. Monitored under EPA rules as part of broad PFAS surveillance.
- **Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)** — Perfluoro(2-ethoxyethane)sulfonic acid, a PFAS-related compound. Monitored under EPA rules as part of broad PFAS surveillance.
- **Perfluorodecanoic acid (PFDA)** — Perfluorodecanoic acid, a longer-chain PFAS 'forever chemical.' Monitored under EPA rules; persistent and bioaccumulative.
- **Perfluorododecanoic acid (PFDoA)** — Perfluorododecanoic acid, a longer-chain PFAS 'forever chemical.' Monitored under EPA rules; persistent and bioaccumulative.
- **Perfluoroheptanesulfonic acid (PFHpS)** — Perfluoroheptanesulfonic acid, a PFAS 'forever chemical.' Monitored under EPA rules; persistent in the environment.
- **Perfluoroheptanoic acid** — Perfluoroheptanoic acid, a PFAS 'forever chemical.' Monitored under EPA rules; persistent in the environment.
- **Perfluorohexanoic acid** — Perfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' Monitored under EPA rules; persistent and widely detected.
- **Perfluorononanoic acid** — Perfluorononanoic acid, a PFAS 'forever chemical.' Regulated by the EPA at 10 parts per trillion and included in the PFAS Hazard Index.
- **Perfluoropentanesulfonic acid (PFPeS)** — Perfluoropentanesulfonic acid, a PFAS 'forever chemical.' Monitored under EPA rules; persistent in the environment.
- **Perfluoropentanoic acid** — Perfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.' Monitored under EPA rules; persistent in the environment.
- **Perfluoroundecanoic acid (PFUnA)** — Perfluoroundecanoic acid, a longer-chain PFAS 'forever chemical.' Monitored under EPA rules; persistent and bioaccumulative.
- **PFBA** — Perfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.' Monitored under EPA rules; persistent in the environment and the human body.
- **Total Dissolved Solids** — Total dissolved solids — the combined content of all dissolved minerals and salts. Regulated only as a secondary (cosmetic) standard; high levels affect taste and hardness.
- **Turbidity** — A measure of cloudiness from suspended particles in the water. High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.
- **Atrazine** — A widely used agricultural herbicide that reaches water through runoff. Long-term exposure above the federal limit can affect the cardiovascular and reproductive systems.
- **Xylenes** — A group of industrial solvents found in gasoline and paint. Long-term exposure above the federal limit can damage the nervous system.

## How to read this

- A water-quality report covers an entire service area, not a single address.
- 'Federal limit' is the EPA standard (MCL, action level, treatment technique, etc.) that the measured level is compared against.
- 'At or above the federal limit' means the utility's own reported figure met or exceeded that standard.

_Figures are the utility's own published numbers. Generated 2026-05-26 from thewatermap.com._