Pahrump Well Owners Group Hosts Free Talk on Groundwater Contamination April 1

Christopher Berkey set up a groundwater demonstration model inside the Pahrump Valley Museum on April 1 and showed well owners exactly what happens underground when fertilizer, pesticides or an improperly disposed household chemical reaches Basin 162, the single aquifer supplying every tap in the Pahrump Valley.

Berkey, a hydrogeologist and source water protection specialist with the National Rural Water Association, led the free presentation hosted by the Private Well Owners Association at 401 E. Basin Ave., titled "How Pollution Gets Into Our Water." The hands-on model traced the path of common contaminants as they migrate from surface soils through the ground into shallow aquifers and, ultimately, private wells, often long before any homeowner detects a problem.

The demonstration had a direct local dimension: more than 11,000 domestic wells and septic systems currently operate within the Pahrump Valley, all drawing from and discharging near the same Basin 162 formation. That density concentrates the nitrate risk in particular, since nitrogen compounds from septic discharge and agricultural runoff accumulate gradually and reach dangerous levels without any taste or odor. The EPA's maximum contaminant level for nitrate stands at 10 milligrams per liter, and any detection of E. coli or fecal coliform means stopping water use immediately.

Berkey also addressed cones of depression, the mechanism by which sustained heavy pumping lowers the regional water table and bends groundwater flow patterns in ways that can pull surface contaminants toward active wells rather than away from them. That risk is not theoretical in Pahrump. Groundwater levels have declined steadily in Pahrump since the 1950s, despite numerous efforts by the state engineer to regulate pumping and stabilize the aquifer. The Nevada State Engineer has since banned new residential wells in the valley without an offsetting water rights purchase, citing a groundwater basin that is "severely over-appropriated" and cannot sustain further withdrawals.

Annual lab testing remains the most direct safeguard available to existing well owners. A comprehensive panel typically costs $100 to $500 at a state-certified laboratory, while at-home kits run $20 to $100 for basic parameters like bacteria, nitrates and pH. The EPA recommends testing at minimum for bacteria and nitrates once a year, and immediately after any nearby chemical spill, flood event or septic system repair. The Nye County Water District at 2340 E. Calvada Blvd. maintains a list of NDEP-certified labs serving Pahrump households and can be reached at 775-727-3487.

The April 1 talk was the second in a water protection and conservation series organized by the Private Well Owners Association. The next milestone is the 23rd Annual Pahrump Earth/Arbor Day Celebration on April 18, with groundwater issues expected to remain central as county debates over well permitting, zombie lot development and long-term aquifer sustainability continue to push Basin 162 onto the public agenda.