# Santa Rosa, City of, CA — Drinking Water Quality (2023)

> Contaminant levels for the Santa Rosa, City of, CA public water system from its 2023 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/santa-rosa/2023
- JSON API: https://www.thewatermap.com/api/water/ca/santa-rosa/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: 5
- 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 |
|---|---|---|---|---|---|
| Bromodichloromethane | Disinfection byproducts | 9.3375 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Bromoform | Disinfection byproducts | 0.82125 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Chloroform | Disinfection byproducts | 16.85125 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Dibromochloromethane | Disinfection byproducts | 5.68875 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| HAA5 | Disinfection byproducts | 10.2375 UG/L (Average) | Distribution | 60 UG/L (MCL) | Within the limit |
| TTHM | Disinfection byproducts | 32.775 UG/L (Average) | Distribution | 80 UG/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | Not detected MG/L (Highest single sample) | Source water | 10 MG/L (MCL) | None detected |
| Manganese | Metals | 74.75 UG/L (Average) | Source water | 50 UG/L (MCL) | At or above the limit |
| Dbaa | Other | 1.3625 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Dcaa | Other | 5.7125 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 | 3.35 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| 1,2,3-TCP | VOCs & pesticides | Not detected UG/L (Highest single sample) | Source water | 0.005 UG/L (MCL) | None detected |

## What these contaminants are

- **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.
- **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.
- **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.

## 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._