Drinking Water Standards Exceeded For TTHMs
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Calexico Water Treatment Plant’s Water System Recently Exceeded Drinking Water Standards for TTHMs

CALEXICO — The Calexico Water Treatment Plant’s water system recently exceeded drinking water standards for total trihalomethanes, also known as TTHMs, according to a Jan. 23 press release from the city.

“While we are required to notify residents and customers of any exceedance of standards, the water treatment plant wants to confirm with the public that there is no immediate risk,” the city stated in the release.

TTHMs are common disinfection process byproducts that form when chlorine reacts with natural organic material present in the source water. Although an increase of TTHMs was detected, the water remains safe to drink and use for cooking, bathing and cleaning, according to the press release.

This is not an emergency and city water customers do not need to boil water or take other actions. The U.S. Environmental Protection Agency and State Water Resources Control Board Division of Drinking Water have established public notification rules and tiers under which specific violations are assigned. The TTHM violation is a Tier 2 violation of the drinking water regulations. Tier 2 violations are considered less urgent than Tier 1 violations because there is little immediate risk to consumers. Tier 2 violations require a public notification delivered to customers after a violation is discovered.

The Calexico Water Treatment Plant is currently evaluating the feasibility of implementing several treatment options in order to meet TTHM standard. The city is working closely with the State Water Resources Control Board, Division of Drinking Water to resolve the issue. We anticipate resolving the issue within 12 months.

For more information, contact Jose L. Saldana, water system supervisor, at 760-768-2160 or at the following mailing address: 549 Pierce Ave., Calexico, California.


This story is featured in the Jan 30, 2020 e-Edition.

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