drinking water - water quality monitoring

Imported Bottled Water (Non-VT Water Sources)

If the bottled water system is in another state or country (Imported bottled water system), a statement from the appropriate regulatory agency with jurisdiction over the bottled water system indicating that the facility has been approved to bottle or package water for human consumption shall be submitted. This approval may be in the form of a copy of a certificate, license, permit, or a letter of approval from the agency.

What are Cyanobacteria?

Magnified cyanobacteria

Cyanobacteria are photosynthesizing bacteria that may produce cyanotoxins that can cause illness to exposed human and animal populations.   A bloom is a visually identified concentration of cyanobacteria that discolors the water.  Cyanobacterial cells may be found at the water surface, at a defined depth, or present throughout the water column. 

Cyanotoxin Monitoring Program

Summer 2020, marks the sixth year DWGWPD is collaborating with the Vermont Department of Health (VDH), to offer at no cost cyanotoxin analysis of raw and finished water at the VDH laboratory for the 22 Lake Champlain-sourced public water systems for 12 weeks (July through September). 

2020 Program

Week One: July 17, 2020 No Cyanotoxin Detections

Week Two: July 24, 2020 No Cyanotoxin Detections

Disinfection Byproducts (DBPs)

Disinfection byproducts (DBP) can form when naturally occurring dissolved organic carbon reacts with a chemical disinfectant such as chlorine. Dissolved organic carbon tends to be higher in surface water sources than in groundwater. Disinfectants are used in public water systems to protect public health by controlling microorganisms, but high DBPs can have health effects, so they are regulated under the federal Stage 2 DBP Rule and the corresponding part of the Vermont Water Supply Rule.

Water Quality Monitoring

All public water systems must perform water quality monitoring to demonstrate that the water provided to customers is safe to drink. The kinds of samples that are required, the number of samples that are required, and the frequency of collection are based on the water system type, population, treatment, and water quality history.  Water quality monitoring requirements for TNC water systems can be divided into two general categories:  source permitting water quality monitoring and routine water quality monitoring.

Revised Total Coliform Rule

The Revised Total Coliform Rule (RTCR) is effective April 1, 2016 and utilizes regular bacteria (coliform) monitoring as an indicator for system integrity, to signal possible fecal contamination, and the presence of waterborne pathogens. The RTCR applies to every public drinking water system in Vermont. This new rule is an update to the 1989 Total Coliform Rule and provides some key changes.


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