# California Domestic Water Company — Whittier, Ca, CA — Drinking Water Quality (2021)

> Contaminant levels for the California Domestic Water Company — Whittier, Ca, CA public water system from its 2021 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/california-domestic-water-company-whittier-ca/2021
- JSON API: https://www.thewatermap.com/api/water/ca/california-domestic-water-company-whittier-ca/2021
- 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: 2021
- Contaminants measured: 23
- Contaminants with a federal limit: 14
- Contaminants at or above the federal limit: 3
- Part of The Water Map — https://www.thewatermap.com

## Contaminants measured

| Contaminant | Category | Measured level | Sampling context | Federal limit | Status |
|---|---|---|---|---|---|
| Chlorine | Disinfectants | 1.35 mg/L (Average) | SGVWC (Purchased Water) | 4 mg/L (MCL) | Within the limit |
| Chloroform | Disinfection byproducts | 0.57 ug/L (Average) | Bassett Wellfield (Raw Groundwater) | No federal limit | Detected — no federal limit |
| NDMA | Disinfection byproducts | 5.1 ng/L (Average) | Bassett Wellfield (Raw Groundwater) | 10 ng/L (NL) | Detected — no federal limit |
| Perchlorate | Disinfection byproducts | 5.3 ug/L (Average) | Bassett Wellfield (Raw Groundwater) | No federal limit | Detected — no federal limit |
| TTHM | Disinfection byproducts | 0.57 ug/L (Average) | Bassett Wellfield (Raw Groundwater) | No federal limit | Within the limit |
| Fluoride | Inorganic chemicals | 0.37 mg/L (Average) | SGVWC (Purchased Water) | 4 mg/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | 5.6 mg/L (Average) | SGVWC (Purchased Water) | 10 mg/L (MCL) | Within the limit |
| Arsenic | Metals | 2.1 ug/L (Average) | SGVWC (Purchased Water) | No federal limit | Within the limit |
| Barium | Metals | 0.129 mg/L (Average) | Bassett Wellfield (Raw Groundwater) | 2 mg/L (MCL) | Within the limit |
| Chromium, Hexavalent | Metals | 3.9 ug/L (Average) | SGVWC (Purchased Water) | 0.02 ug/L (Public health goal) | Detected — no federal limit |
| Carbon Tetrachloride | Other | 444 ng/L (Average) | Bassett Wellfield (Raw Groundwater) | No federal limit | Within the limit |
| Chromium | Other | 3.9 ug/L (Average) | SGVWC (Purchased Water) | No federal limit | Within the limit |
| Cis Dichloroethylene 12 | Other | 2.04 ug/L (Average) | Bassett Wellfield (Raw Groundwater) | No federal limit | Within the limit |
| Dichloroethylene 11 | Other | 2.76 ug/L (Average) | Bassett Wellfield (Raw Groundwater) | No federal limit | Within the limit |
| Radium 226 228 | Other | Not detected pCi/L (Average) | Bassett Wellfield (Raw Groundwater) | 5 pCi/L (MCL) | None detected |
| Perfluorobutanesulfonic acid | PFAS ("forever chemicals") | 0.9 ng/L (Average) | Bassett Wellfield (Raw Groundwater) | No federal limit | Detected — no federal limit |
| Perfluorohexanesulfonic acid | PFAS ("forever chemicals") | 2.4 ng/L (Average) | Bassett Wellfield (Raw Groundwater) | 3 ng/L (NL) | Within the limit |
| PFOA | PFAS ("forever chemicals") | 3.9 ng/L (Average) | Bassett Wellfield (Raw Groundwater) | 5.1 ng/L (NL) | Approaching the limit |
| PFOS | PFAS ("forever chemicals") | 9.1 ng/L (Average) | Bassett Wellfield (Raw Groundwater) | 6.5 ng/L (NL) | At or above the limit |
| Gross Alpha | Radionuclides | 1.1 pCi/L (Average) | Bassett Wellfield (Raw Groundwater) | 15 pCi/L (MCL) | Within the limit |
| Uranium | Radionuclides | 2.7 pCi/L (Average) | Bassett Wellfield (Raw Groundwater) | 20 pCi/L (MCL) | Detected — no federal limit |
| Tetrachloroethylene | VOCs & pesticides | 17.7 ug/L (Average) | Bassett Wellfield (Raw Groundwater) | 5 ug/L (MCL) | At or above the limit |
| Trichloroethylene | VOCs & pesticides | 20.9 ug/L (Average) | Bassett Wellfield (Raw Groundwater) | 5 ug/L (MCL) | At or above the limit |

## What these contaminants are

- **Chlorine** — A disinfectant added to drinking water to kill bacteria and viruses. Effective and necessary, but high residual levels can cause taste and odor issues; the EPA caps the residual disinfectant level.
- **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.
- **Perchlorate** — A chemical used in rocket fuel and fireworks that can also form during disinfection. Can interfere with thyroid hormone production; has no national enforceable limit but is regulated in some states.
- **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.
- **Fluoride** — A mineral often added to drinking water to help prevent tooth decay. Beneficial at low levels, but long-term exposure above the federal limit can cause bone disease and tooth mottling.
- **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.
- **Arsenic** — A naturally occurring element that also enters water from industry and agriculture. A known human carcinogen; long-term exposure is linked to skin, bladder, and lung cancer.
- **Barium** — A metal from erosion of natural deposits and industrial discharge. Long-term exposure above the federal limit can raise blood pressure.
- **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.
- **Perfluorobutanesulfonic acid** — Perfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' Has no standalone limit but is part of the EPA PFAS Hazard Index that limits PFAS in combination.
- **Perfluorohexanesulfonic acid** — Perfluorohexanesulfonic acid, a PFAS 'forever chemical.' Regulated by the EPA at 10 parts per trillion and included in the PFAS Hazard Index.
- **PFOA** — Perfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. Linked to cancer, liver damage, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
- **PFOS** — Perfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. Linked to cancer, thyroid disease, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
- **Gross Alpha** — Gross alpha particle activity — a combined measure of alpha-emitting radioactive substances. Long-term exposure above the federal limit increases cancer risk.
- **Uranium** — A naturally occurring radioactive metal from erosion of natural deposits. Long-term exposure above the federal limit can damage the kidneys and increase cancer risk.
- **Tetrachloroethylene** — An industrial solvent (PCE) used in dry cleaning and degreasing. A likely human carcinogen; long-term exposure above the federal limit can damage the liver and kidneys.
- **Trichloroethylene** — An industrial solvent (TCE) used in metal degreasing. A known human carcinogen; long-term exposure above the federal limit can damage the liver.

## 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 2026-06-04 from thewatermap.com._