A water supply permit amendment issued by the state includes a list of 10 conditions the City must meet

The City of Mt. Shasta was notified today that it can discontinue the chlorination of its public water system that had been ongoing since July 28.

The State Water Resources Control Board Division of Drinking Water announced its decision in a letter to the City that included an amendment to the City’s domestic water supply permit.

Mt. Shasta Public Works Director Rod Bryan said the chlorination equipment was turned off Friday afternoon, Aug. 18, and he expects all chlorine to be gone from the system in 24 to 48 hours.

Water samples will be taken Monday, Bryan said.

The state had been requiring the city to do continuous chlorination of its public water system since July 28, after routine tests and follow-up tests showed the presence of E. Coli bacteria in the water.

After the source of the contamination was determined to be the City's oldest water storage tank, Tank 1, that tank was physically and permanently disconnected from the water system on Aug. 10.

While the state continued to require continuous chlorination, the Mount Shasta City Council, staff and public “made it clear they don’t want permanently chlorinated water,” according to City Manager Bruce Pope, and citizens were contacting the State by phone and email to express that.

The state's water supply permit amendment includes background information about the City’s public water system and a list of 10 conditions the City is now required to meet, including increasing the frequency of its collection of routine coliform analysis water samples to at least two samples per week. Bryan said the previous requirement was six samples per month.

The first condition on the list was removal of Tank 1 from the list of approved potable water facilities for use by the City’s public water system. Sanitary defects in Tank 1 were determined to be the most probable source of E. Coli and Total Coliform detected in July, according to the water supply permit amendment. 

A copy of the State Water Resources Control Board’s Aug. 18 letter to the City and the Amendment to the City’s Domestic Water Supply Permit is available on the City’s website at: http://mtshastaca.gov/wp/wp-content/uploads/2017/08/Mt.-Shasta-Permit-Amendment-August-18-2017.pdf.