1. 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

2. 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

4. 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

5. Washoe Valley

6. Heppner

7. 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

8. 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

9. Questions?