# Gswc - Calipatria — San Dimas, Ca, CA — Drinking Water Quality (2023)

> Contaminant levels for the Gswc - Calipatria — San Dimas, Ca, CA public water system from its 2023 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/gswc-calipatria-san-dimas-ca/2023
- JSON API: https://www.thewatermap.com/api/water/ca/gswc-calipatria-san-dimas-ca/2023
- 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: 2023
- Contaminants measured: 14
- Contaminants with a federal limit: 6
- Contaminants at or above the federal limit: 0
- Part of The Water Map — https://www.thewatermap.com

## Contaminants measured

| Contaminant | Category | Measured level | Sampling context | Federal limit | Status |
|---|---|---|---|---|---|
| Chlorine | Disinfectants | 1.3 mg/L (Average) | System-wide | 4 mg/L (MCL) | Within the limit |
| HAA5 | Disinfection byproducts | 15 ug/L (Average) | System-wide | No federal limit | Within the limit |
| TTHM | Disinfection byproducts | 62 ug/L (Average) | System-wide | No federal limit | Within the limit |
| Fluoride | Inorganic chemicals | 0.35 mg/L (Average) | System-wide | 4 mg/L (MCL) | Within the limit |
| Aluminum | Metals | 0.1 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Arsenic | Metals | 2.8 ug/L (Average) | System-wide | No federal limit | Within the limit |
| Barium | Metals | 0.14 mg/L (Average) | System-wide | 2 mg/L (MCL) | Within the limit |
| Copper | Metals | Not detected mg/L (90th percentile) | At the tap | 1.3 mg/L (Action level) | None detected |
| Lead | Metals | Not detected ug/L (90th percentile) | At the tap | No federal limit | None detected |
| Lithium | Metals | 71 (Average) | System-wide | No federal limit | Detected — no federal limit |
| Total Coliform | Microbial | 2 (Reported level) | System-wide | 0 (Public health goal) | Detected — no federal limit |
| Uranium | Radionuclides | 2.4 pCi/L (Average) | System-wide | 20 pCi/L (MCL) | Detected — no federal limit |
| Ethylbenzene | VOCs & pesticides | Not detected ug/L (Average) | System-wide | No federal limit | Within the limit |
| Xylenes | VOCs & pesticides | Not detected mg/L (Average) | System-wide | No federal limit | Within 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.
- **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.
- **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.
- **Aluminum** — A common element sometimes used as a treatment coagulant. Regulated only as a secondary (cosmetic) standard; high levels can discolor water.
- **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.
- **Copper** — A metal that enters water from corroding household plumbing. Short-term exposure causes stomach distress; long-term exposure can damage the liver and kidneys.
- **Lead** — A toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. There is no safe level of lead; it harms brain development in children and raises blood pressure in adults. The EPA sets an action level, not a health goal above zero.
- **Lithium** — A naturally occurring element found in some groundwater. No enforceable federal limit; on the EPA contaminant candidate list for further study.
- **Total Coliform** — A group of bacteria used as an indicator of overall water-system sanitation. Coliforms themselves are usually harmless, but their presence signals that disease-causing organisms could enter the system.
- **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.
- **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 2026-06-04 from thewatermap.com._