Tri General Improvement District

Water Quality Snapshot: Tri General Improvement District

Tri General Improvement District is a local-owned non-transient non-community water system that delivers drinking water to 13,360 residents in McCarran, Nevada (Storey County) through 238 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 818 total violations for this system , of which 12 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 805 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Arsenic, recorded in 38 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across Nevada, EPA tracks 589 public water systems serving 3,455,285 people, with 56,333 cumulative violations and 6,657 health-based violations on record. About 93% of systems in the state carry at least one violation, and state-wide the average per system is 95.6 violations. Statewide, 50 of 57 UCMR5-tested systems have reported PFAS detections (87.7%).

Tri General Improvement District's 818 violations sit above the Nevada average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.