District Headquarters

50 Elm St., Dedham, MA 02026

During Office Hours:

781-329-7090

After Hours Emergency:

781-326-1250

Lead and Copper Testing Results

Lead and Copper Testing Overview

The Dedham-Westwood Water District has demonstrated compliance with state and federal standards for lead and copper levels in drinking water.

Compliance for lead is achieved when at least 90% of samples collected at MassDEP-approved sample sites (30 homes) have a lead level below the Action Level (AL) of 15 Parts Per Billion (PPB).

Compliance for copper is achieved when at least 90% of samples collected at MassDEP have a copper level below the Action Level (AL) of 1.3 Parts Per Million (PPM). 

2022 Testing Results

Testing is conducted every three years.

In 2022, the District sampled 31 sites for lead and copper during the months of June-September. 

Detected Parameter (Units) EPA's AL for Sampling of Customer Homes with the Highest Risk Maximum Contaminant Level Goal Results Compliance Achieved Source
Lead 90% of all homes tested must be below 15 PPB 0 PPB 90% of all homes tested measured below 3 PPB in the spring sampling event, and below 2 PPB in the fall sampling event. Yes Corrosion of household plumbing; erosion of natural deposits. There was 1 site with a value above the AL of 15 PPB in the fall sampling event.
Copper 90% of all homes tested must be below 1.3 PPM 1.3 PPM 90% of all homes tested measured below 0.14 PPM in the spring sampling event, and below 0.10 PPM in the fall sampling event. Yes Corrosion of household plumbing; erosion of natural deposits; leaching from wood preservatives. There were NO sites with values above the copper AL of 1.3 PPM