Northern Nevada Water Planning Commission Septic Nitrate Baseline Data and Impact Assessment Study for Washoe County Phase II: In-Depth Analysis of Prioritized Study Areas, Baseline Dataset Creation, & Impact Assessment Northern Nevada Water Planning Commission August 3, 2016 NNWPC Item 7

Project Objectives In depth analysis to determine potential impact to water quality Nine prioritized study areas identified in Phase I Revisit Washoe Valley, Cold Springs, and Heppner 307 wells sampled throughout 12 study areas Analyzed for nitrate, chloride and TDS Water level and water quality parameters

Average Nitrate (mg/L) Maximum Nitrate (mg/L) Water Quality Results 4 study areas recorded wells over MCL of 10 mg/L Study Area Average Nitrate (mg/L) Maximum Nitrate (mg/L) Ambrose 0.88 2.10 Cold Springs 2.75 6.10 Geiger Grade 1.54 6.70 Heppner 4.53 19.00 Hidden Valley 0.23 0.94 Huffaker 1.98 9.10 Island 18 0.71 1.60 Mogul 0.70 3.60 Mt Rose 3.81 10.00 Pleasant Valley 2.26 7.10 Verdi 1.72 Washoe Valley 7.02 50.00

Washoe Valley

Heppner

Nitrate Informational Mailings July 2016: 5,000 letters mailed to all domestic well owners within 12 study areas Nitrate informational and resource guide Summary of nitrate concentrations in area Provided local contacts for questions or additional services and information

Recommendations Contract extension or new Interlocal Agreement $91,000 remaining in budget Public outreach component Interactive public sessions [ex. CAB meetings] Additional mailings to well owners outside of the 12 study areas

Questions?