# City of Stockton, CA — Drinking Water Quality (2026)

> Contaminant levels for the City of Stockton, CA public water system from its 2026 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/stockton/2026
- JSON API: https://www.thewatermap.com/api/water/ca/stockton/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: 45
- Contaminants with a federal limit: 13
- Contaminants at or above the federal limit: 2
- Part of The Water Map — https://www.thewatermap.com

## Contaminants measured

| Contaminant | Category | Measured level | Sampling context | Federal limit | Status |
|---|---|---|---|---|---|
| Bromate | Disinfection byproducts | 6.333333333333333 UG/L (Average) | Entry point | 10 UG/L (MCL) | Within the limit |
| Bromodichloromethane | Disinfection byproducts | 6.267894736842106 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Bromoform | Disinfection byproducts | 0.5284210526315789 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Chloroform | Disinfection byproducts | 36.597368421052636 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Dibromochloromethane | Disinfection byproducts | 0.9036842105263159 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| HAA5 | Disinfection byproducts | 21.847368421052632 UG/L (Average) | Distribution | 60 UG/L (MCL) | Within the limit |
| TTHM | Disinfection byproducts | 43.42894736842105 UG/L (Average) | Distribution | 80 UG/L (MCL) | Within the limit |
| Bromide | Inorganic chemicals | 0.05975 MG/L (Average) | Source water | No federal limit | Detected — no federal limit |
| Chloride | Inorganic chemicals | 23.95 MG/L (Average) | Source water | 500 MG/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | 4.3 MG/L (Average) | Source water | 10 MG/L (MCL) | Within the limit |
| Nitrite | Inorganic chemicals | Not detected MG/L (Highest single sample) | Entry point | 1 MG/L (MCL) | None detected |
| Calcium | Metals | Not detected MG/L (Highest single sample) | Entry point | No federal limit | None detected |
| Chromium, Hexavalent | Metals | 0.136 UG/L (Average) | Source water | 10 UG/L (MCL) | Within the limit |
| Iron | Metals | Not detected UG/L (Highest single sample) | Entry point | 300 UG/L (MCL) | None detected |
| Manganese | Metals | Not detected UG/L (Highest single sample) | Entry point | 50 UG/L (MCL) | None detected |
| Dbaa | Other | 0.5736842105263158 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Dcaa | Other | 12.163157894736841 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Mbaa | Other | Not detected UG/L (Highest single sample) | Distribution | No federal limit | None detected |
| Mcaa | Other | Not detected UG/L (Highest single sample) | Distribution | No federal limit | None detected |
| Tcaa | Other | 9.58421052631579 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | 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) | Source water | No federal limit | None detected |
| 6:2 Fluorotelomer sulfonic acid (6:2 FTS) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| 8:2 Fluorotelomer sulfonic acid (8:2 FTS) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | 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) | Source water | 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) | Source water | No federal limit | None detected |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| Perfluorodecanoic acid (PFDA) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| Perfluorododecanoic acid (PFDoA) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| Perfluoroheptanesulfonic acid (PFHpS) | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| Perfluoroheptanoic acid | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| Perfluorohexanoic acid | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| 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") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| Perfluoropentanoic acid | PFAS ("forever chemicals") | Not detected NG/L (Highest single sample) | Source water | No federal limit | None detected |
| 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 |
| Alkalinity | Physical & aggregate | 36.5 MG/L (Average) | Source water | No federal limit | Detected — no federal limit |
| Color | Physical & aggregate | 20 UNITS (Average) | Source water | 15 UNITS (MCL) | At or above the limit |
| Odor | Physical & aggregate | 5.8 TON (Average) | Source water | 3 TON (MCL) | At or above the limit |
| Specific Conductance | Physical & aggregate | 201 UMHO/CM (Average) | Entry point | 1600 UMHO/CM (MCL) | Within the limit |
| Total Dissolved Solids | Physical & aggregate | 243.42857142857142 MG/L (Average) | Source water | 1000 MG/L (MCL) | Within the limit |

## What these contaminants are

- **Bromate** — A disinfection byproduct formed when bromide-containing water is treated with ozone. Classified as a probable human carcinogen; the EPA sets a strict maximum contaminant level.
- **Bromodichloromethane** — A trihalomethane disinfection byproduct. Counted within regulated total trihalomethanes; long-term exposure is associated with cancer and reproductive effects.
- **Bromoform** — A trihalomethane disinfection byproduct. Counted within regulated total trihalomethanes; long-term exposure is associated with liver and kidney effects.
- **Chloroform** — A trihalomethane formed when chlorine reacts with organic matter in water. A component of regulated total trihalomethanes; long-term exposure is linked to liver and kidney effects.
- **Dibromochloromethane** — A trihalomethane disinfection byproduct. Part of regulated total trihalomethanes; long-term exposure is linked to nervous-system, liver, and kidney effects.
- **HAA5** — Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. Long-term exposure above the federal limit is associated with an increased cancer risk.
- **TTHM** — Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
- **Bromide** — A naturally occurring salt found in source water. Not directly regulated, but a precursor that increases formation of brominated disinfection byproducts.
- **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.
- **Nitrite** — A compound from fertilizer runoff, sewage, and erosion of natural deposits. Like nitrate, elevated levels can cause 'blue baby syndrome' in infants.
- **Calcium** — A naturally occurring mineral that contributes to water hardness. Not federally regulated for health; affects scaling and taste.
- **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.
- **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.
- **Alkalinity** — A measure of the water's capacity to neutralize acids. Not federally regulated for health; relevant to corrosion control and treatment.
- **Color** — A measure of visible tint in the water. Regulated only as a secondary (cosmetic) standard.
- **Odor** — A measure of detectable smell in the water. Regulated only as a secondary (cosmetic) standard.
- **Specific Conductance** — A measure of how well water conducts electricity, which tracks dissolved mineral content. Not federally regulated for health; used as a proxy for total dissolved solids.
- **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.

## 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._