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Press Release

Wednesday, September 19, 2018

Post Date:09/19/2018 10:00 AM


Calistoga City Seal

City of Calistoga


For Immediate Release
September 19, 2018

Contact: Mike Kirn
Public Works Director
(707) 942-2828

Disinfection By-Product Compliance for Calistoga’s Drinking Water.

The Public Works Department is pleased to report that we received our third quarter test results for disinfection by-products, and for the third straight quarter all samples were below the limits established by the Department of Water Resources – Division of Drinking Water. In addition, the running four quarter averages were also below established limits.

Disinfection byproducts are common byproducts from chlorine reacting with naturally occurring organics in the water during the disinfection treatment process. Trihalomethanes (THMs) and haloacetic acids (HAAs) are measured every quarter, with a four quarter running average used for compliance monitoring. The limit for THMs is 80 parts per billion (ppb) and the limit for HAAs is 60 ppb.

Public Works staff works aggressively to reduce the amount of disinfection by-products in Calistoga’s drinking water. We are in regular communication with the State Water Resources Control Board - Division of Drinking Water and we recently engaged the services of a specialist in water chemistry and have selected an outside consultant in the water treatment industry to assist the City in identifying economical measures for removal/reduction of disinfection by-products.

The reduction in disinfection by-products over the past nine months demonstrates our efforts are paying dividends, but we remain diligent. Recent efforts include changing out the filter media in the filters at the Kimball Water Treatment Plant, installation of THM removal equipment in the Mt Washington tank, fine tuning the amount of disinfection chemicals used, replacing the Fiege Tank and installing THM removal equipment (completion scheduled for late 2018) and distribution system flushing.

Please be assured the City is doing everything it can to improve water quality and we appreciate your patience. If you have any questions please call us at 707-942-2828.

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