# Brockton, MA — Drinking Water Quality (2024)

> Contaminant levels for the Brockton, MA public water system from its 2024 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ma/brockton/2024
- JSON API: https://www.thewatermap.com/api/water/ma/brockton/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: 12
- Contaminants with a federal limit: 8
- 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 | 0.48–1.35 mg/L (Range) | System-wide | No federal limit | Detected — no federal limit |
| HAA5 | Disinfection byproducts | 2.3–29 ug/L (Range) | System-wide | 60 ug/L (MCL) | Within the limit |
| Perchlorate | Disinfection byproducts | 0.13 ug/L (Reported level) | System-wide | 2 ug/L (MCL) | Within the limit |
| TTHM | Disinfection byproducts | 17–68 ug/L (Range) | System-wide | 80 ug/L (MCL) | Approaching the limit |
| Nitrate | Inorganic chemicals | 0.18 mg/L (Reported level) | System-wide | 10 mg/L (MCL) | Within the limit |
| Barium | Metals | 0.008 mg/L (Reported level) | System-wide | 2 mg/L (MCL) | Within the limit |
| Copper | Metals | 0.045 mg/L (90th percentile) | At the tap | 1.3 mg/L (Action level) | Within the limit |
| Lead | Metals | 4 ug/L (90th percentile) | At the tap | 15 ug/L (Action level) | Within the limit |
| Sodium | Metals | 27 mg/L (Reported level) | System-wide | No federal limit | Detected — no federal limit |
| PFAS | PFAS ("forever chemicals") | 2.2 ng/L (Reported level) | System-wide | 20 ng/L (MCL) | Within the limit |
| TOC | Physical & aggregate | 2.077 (Reported level) | System-wide | No federal limit | Detected — no federal limit |
| Turbidity | Physical & aggregate | 0.09 NTU (Reported level) | System-wide | No federal limit | Detected — no federal 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.
- **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.
- **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.
- **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.
- **Sodium** — A naturally occurring salt component. Not federally regulated for health; relevant for people on sodium-restricted diets.
- **TOC** — Total organic carbon — a measure of organic material dissolved in the water. Not harmful itself, but it is the raw material that forms disinfection byproducts; removal is a treatment requirement.
- **Turbidity** — A measure of cloudiness from suspended particles in the water. High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.

## 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._