Mild Weather Source Water Quality

Dear RRID residents,

As we enter late autumn, we want to remind everyone that this is one of the two times each year (late autumn and late spring) when our Norns Creek source water is naturally prone to reduced raw water quality. Mild weather and rainfall higher in the watershed mobilize organic material left over from snowmelt and the changing seasons, causing temporary increasing color, turbidity, and dissolved natural organic matter in the raw water entering the treatment plant.

These seasonal conditions challenge our UV disinfection system, which relies on clearer water to be fully effective. Please be assured that the water treatment plant is currently providing full conventional treatment plus UV disinfection and the treated water continues to meet all health-related drinking water standards.

This is simply our routine seasonal reminder that “it’s that time again.” We will continue to monitor conditions closely and will notify you immediately if additional steps (such as a quality advisory) ever become necessary.

Thank you for your understanding; these brief, predictable challenges are a normal part of protecting public health within a dynamic mountain watershed.

RRID Administration

December 13, 2025