PIMA COUNTY - In response to the partial breach of the International Outfall Interceptor (IOI) in Santa Cruz County, Pima County has conducted water quality sampling in the Santa Cruz River. The sampling is consistent with the results acquired by the Arizona Department of Environmental Quality in earlier tests.
ADEQ’s test results area available here.
The risk of contamination of the river may have been elevated due to the partial breach of the IOI. Pollutant concentrations within the Santa Cruz River normally spike with storm water runoff. Even in the absence of untreated wastewater, storm flows are typically high in pollutants that can be harmful. We want to remind citizens to avoid areas with flowing or standing water from flood events.
At 2 a.m. on August 2, crews in Nogales, Arizona completed installation of a bypass system to divert leaking sewage from the partial breach. The sewage is now being conveyed for treatment at the Nogales International Wastewater Treatment Plant and is no longer flowing into the Nogales Wash or the Santa Cruz River.
More information on sampling results and recommendations for livestock and private well owners with concerns can be found at https://ein.az.gov/emergency-responsepartial-breach-sewage-pipe-nogales-wash.
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