# Metropolitan of Baltimore, MD — Drinking Water Quality (2024)

> Contaminant levels for the Metropolitan of Baltimore, MD public water system from its 2024 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/md/metropolitan-of-baltimore/2024
- JSON API: https://www.thewatermap.com/api/water/md/metropolitan-of-baltimore/2024
- 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: 2024
- Contaminants measured: 3
- Contaminants with a federal limit: 1
- 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 |
|---|---|---|---|---|---|
| HAA5 | Disinfection byproducts | 9.3–39.3 ug/L (Range) | System-wide | No federal limit | Detected — no federal limit |
| TTHM | Disinfection byproducts | 23.6–91.2 ug/L (Range) | System-wide | No federal limit | Detected — no federal limit |
| Copper | Metals | 0.029 mg/L (90th percentile) | At the tap | 1.3 mg/L (MCLG) | Within the limit |

## What these contaminants are

- **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.

## 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 2026-05-25 from thewatermap.com._