Committee flags harmful algal blooms in Chuck Slough; seeks broader review of water wholesaling and septic links
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Summary
Committee members raised concerns that wholesale water sold by the city to areas without sewer (e.g., Saringa Heights) may return as septic effluent to groundwater and sloughs, contributing nutrients that fuel harmful algal blooms; members proposed bringing the issue back as an April agenda item and exploring university and multi-jurisdictional study options.
At roundtable, a committee member raised concerns about harmful algal blooms in Chuck Slough and asked whether the city's practice of wholesaling treated drinking water to nearby districts without sewer service could be contributing nutrients to local sloughs via septic discharge.
A member explained the pathway: treated water pumped to outside areas is used in homes, becomes wastewater that goes to septic drainfields and groundwater, and then discharges to surface waters such as local sloughs. "These harmful algae blooms need nutrients," the speaker said, and suggested the combination of warm temperatures, nutrients and stagnant water in sloughs makes conditions conducive to blooms.
Committee members discussed jurisdictional and implementation constraints: the wholesale water agreements generally cover treated water supply outside city limits but not sewer service; the city lacks direct authority over county-on-site septic permitting. Speakers noted county environmental-health databases include septic permit records (installation dates and permit drawings) and suggested engaging county health, the Idaho Department of Environmental Quality and Idaho Department of Water Resources for a coordinated response.
A committee member offered to provide a briefing paper and recommended bringing the topic back as an agenda item for the April meeting to scope next steps, which could include seeking university research partners or requesting an educational agenda item before council. Members acknowledged this will likely require multi-jurisdictional coordination and potential state involvement.
Next steps: the committee agreed to add the water-quality briefing as a full agenda item in April, and staff will consult with city directors and the mayor about the most effective way to pursue study or multi-agency coordination.
