# Rincon Del Diablo MWD (id-a) — Escondido, Ca, CA — Drinking Water Quality (2023)

> Contaminant levels for the Rincon Del Diablo MWD (id-a) — Escondido, Ca, CA public water system from its 2023 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/rincon-del-diablo-mwd-id-a-escondido-ca/2023
- JSON API: https://www.thewatermap.com/api/water/ca/rincon-del-diablo-mwd-id-a-escondido-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: 9
- Contaminants with a federal limit: 5
- 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 |
|---|---|---|---|---|---|
| Chlorate | Disinfection byproducts | 350–620 ug/L (Range) | Escondido | 800 ug/L (NL) | Detected — no federal limit |
| Chlorite | Disinfection byproducts | 0.28–0.59 mg/L (Range) | Escondido | 1 mg/L (MCL) | Within the limit |
| HAA5 | Disinfection byproducts | 20 ug/L (Average) | Rincon Water System | No federal limit | Within the limit |
| TTHM | Disinfection byproducts | 46 ug/L (Average) | Rincon Water System | No federal limit | Within the limit |
| Copper | Metals | 0.42 mg/L (90th percentile) | At the tap | 1.3 mg/L (Action level) | Within the limit |
| Lead | Metals | 6 ug/L (90th percentile) | At the tap | No federal limit | Within the limit |
| Chlorine Total | Other | 1.81 mg/L (Average) | Rincon Water System | 4 mg/L (MCL) | Within the limit |
| Gross Alpha | Radionuclides | 3.3 pCi/L (Average) | Escondido | 15 pCi/L (MCL) | Within the limit |
| Gross Beta Particle Activity | Radionuclides | 13.6 pCi/L (Average) | Escondido | No federal limit | Detected — no federal limit |

## What these contaminants are

- **Chlorate** — A byproduct that can form during disinfection, especially when hypochlorite solutions degrade. Has no enforceable federal limit but is on the EPA contaminant candidate list; high levels can affect the thyroid.
- **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.
- **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.
- **Gross Alpha** — Gross alpha particle activity — a combined measure of alpha-emitting radioactive substances. Long-term exposure above the federal limit increases cancer risk.
- **Gross Beta Particle Activity** — Gross beta particle activity — a combined measure of beta-emitting radioactive substances. Long-term exposure above the federal screening level increases cancer risk.

## 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._