District Headquarters
50 Elm St., Dedham, MA 02026
During Office Hours:
781-329-7090
After Hours Emergency:
781-326-1250
50 Elm St., Dedham, MA 02026
781-329-7090
781-326-1250
TTHMs are a group of disinfection byproducts that form when chlorine compounds, which are used to disinfect water, react with other naturally occurring chemicals in the water. They are colorless and will evaporate out into the air. There are four significant TTHM (chloroform, bromoform, bromodichloromethane, and dibromochloromethane) potentially found in disinfected drinking water and their combined concentration is referred to as total TTHM.
The Dedham-Westwood Water District solicited bids for a TTHM Reduction System in Spring 2022. A contractor has been selected through the Invitation for Bid (IFB) Process; however, due to equipment/supply lead times, the project is not slated to begin until Spring 2023.
The new reduction system will be installed at the District’s four water storage tanks consisting of tank mixers, aerators, and vents. Once the project is completed, the level of TTHMs will be reduced.
We will continue to monitor the public drinking water supply for all regulated inorganic substances, synthetic organics, volatile organic compounds (VOCs), Total Coliform, e.coli bacteria, unregulated (secondary) substances, organic disinfection byproducts, radionuclides, as well as lead and copper. Our team is committed to providing clean, safe water. As stewards of this valuable resource, we take our job to protect public health and safety seriously. Our team of 30+ professionals work around the clock to provide reliable, cost-effective, high-quality water service that protects public health, promotes environmental stewardship, maintains customer confidence, and supports economic development and sustainability.
The standard for TTHMs is 80 PPB. Compliance is determined on a quarterly basis by averaging all samples collected at each location for the last 12 months, Running Annual Average (RAA).
| Sample Location |
Quarter 1 (January - March 2023) |
Quarter 2 (April - June 2023) |
Quarter 3 (July-September 2022) |
Quarter 4 (October - December 2022) |
OEL Q2 | LRAA | Dedham Medical Associates |
Date: January 5, 2023
PPB 59 |
Date: April 4, 2023
PPB 34 |
Date: July 1, 2022
PPB 48 |
Date: October 6, 2022
PPB 64 |
|
|
|---|---|---|---|---|---|---|
| Getty Gas Station |
Date: January 5, 2023
PPB 59 |
Date: April 4, 2023
PPB 52 |
Date: July 1, 2022
PPB 64 |
Date: October 6, 2022
PPB 64 |
|
|
| East Dedham Fire Station |
Date: January 5, 2023
PPB 75 |
Date: April 4, 2023
PPB 56 |
Date: July 1, 2022
PPB 36 |
Date: October 6, 2022
PPB 19 |
|
|
| Far Reach Pump Station |
Date: January 5, 2023
PPB 88 |
Date: April 4, 2023
PPB 35 |
Date: July 1, 2022
PPB 70 |
Date: October 6, 2022
PPB 91 |
|
|
| Maximum Contaminant Level (MCL) = 80 (PPB) | Was OEL exceeded? NO | Was MCL exceeded? NO | ||||
