Nitrate In Drinking Water In Nevada
What residents of Nevada need to know about nitrate in drinking water — including how it enters water, which utilities have documented violations, and what steps to take.
Source: EPA SDWIS, Nevada Division of Environmental Protection (NDEP), CDC · Last reviewed: 2025-01-01
Quick Answer
Is nitrate in drinking water a real concern in Nevada?
Lower risk than most agricultural states — Nevada has limited commercial agriculture and a predominantly urban population. Nitrate concerns exist in specific agricultural valleys and from septic systems in rural areas.
Is this mostly a public-water issue, a private-well issue, or both?
Primarily private well users in agricultural valleys (Carson Valley, Walker Basin) and rural areas with older septic systems; Las Vegas and Reno draw from regulated public systems that monitor nitrate.
What is the main reason residents should care?
Nevada's limited agricultural footprint means lower statewide nitrate risk, but irrigated farming in valleys like the Carson Valley and Walker River basin, along with dairy operations and septic systems in unincorporated areas, can elevate nitrate in local wells.
Key Facts
| EPA Nitrate MCL | 10 mg/L as N |
| Relative risk | Lower than agricultural states — Nevada is predominantly urban with limited commercial farming |
| Agricultural concern | Carson Valley dairy and irrigated crops; Elko County ranching |
| Private well risk | Rural and agricultural valley well users should test annually |
| State oversight | Nevada Division of Environmental Protection (NDEP) |
Why This Matters in Nevada
Nevada is a predominantly urban state — Las Vegas and Reno together account for most of the population — and their water supplies come from regulated public water systems that monitor for nitrate. Nevada's agricultural areas are concentrated in valleys with irrigated farming and cattle ranching. The Carson Valley in Douglas County has some dairy and irrigated crop operations. Rural unincorporated areas in several counties have private wells and septic systems that can interact. NDEP monitors public water systems for nitrate compliance. Private well users in Nevada's agricultural valleys and unincorporated rural areas should test annually.
Critical — Infants Under 6 Months
Do not use tap water that exceeds 10 mg/L nitrate-nitrogen to prepare infant formula or feed infants under six months. Boiling will concentrate nitrate — do not boil. Use bottled water or a certified reverse osmosis system (NSF/ANSI 58) until the issue is resolved.
Largest Nevada Water Utilities
No nitrate violations on record in EPA SDWIS for Nevada utilities in our database. Browse the largest utilities to review their full water quality record.
How Nitrate Gets Into Drinking Water
Agricultural fertilizer and manure runoff
Nitrogen-based fertilizers and animal waste applied to Nevada cropland can leach into groundwater or run off into surface water supplies. This is the dominant nitrate pathway in most agricultural regions.
Septic system effluent
Failing or poorly sited septic systems release nitrogen-rich wastewater near drinking water wells. Rural areas with high well density and aging septic infrastructure face elevated risk.
Concentrated animal feeding operations (CAFOs)
Large livestock facilities generate significant waste. Lagoon leaks and overapplication of manure to nearby fields can create localized nitrate hotspots in groundwater.
Natural geological deposits
In some regions, naturally occurring nitrogen compounds in soil and bedrock contribute background nitrate levels to groundwater independent of agricultural activity.
Who Should Pay Closest Attention
Private well users in Nevada's agricultural valleys — particularly Douglas County's Carson Valley and Elko County's ranching areas — should test for nitrate annually. Rural households in unincorporated areas with both private wells and septic systems should test regardless of proximity to agriculture.
Households with infants under six months
Pregnant residents
Private well owners in agricultural areas
Households near livestock operations or CAFOs
Rural residents on shallow groundwater wells
Households with older or failing septic systems nearby
How to Check Your Situation in Nevada
- 1
Identify your water utility. Use the ZIP lookup below or browse the Nevada utility directory on this site.
- 2
Read your utility's page on this site to see its current risk level and any open nitrate violations.
- 3
Review your utility's most recent Consumer Confidence Report (CCR) — mailed annually or available on the utility's website. It must disclose any MCL exceedances.
- 4
If you are on a private well, arrange testing at a Nevada Division of Environmental Protection (NDEP)-certified lab. Your state health department maintains a list of certified labs. Annual testing is recommended in agricultural areas.
- 5
If you have an infant under six months, use bottled water or a certified RO system (NSF/ANSI 58) immediately as a precautionary measure — do not wait for test results if you are in a high-risk area.
- 6
If your utility issues a nitrate exceedance notice, follow their guidance and do not use tap water for infants until the issue is resolved.
Treatment Options
Carbon filters and boiling do not remove nitrate. Only the options below are effective.
NSF/ANSI Standard 58 — Reverse Osmosis
RO systems certified to NSF/ANSI 58 reduce nitrate by 85–95% at the point of use. Under-sink installation required. The most practical residential option for nitrate concerns.
Distillation
Distillation units effectively remove nitrate along with most other dissolved contaminants. Suitable for drinking and cooking water — not whole-house use.
Anion Exchange
Ion exchange systems designed for nitrate removal exchange nitrate ions for chloride on a resin bed. Effective as a point-of-entry system; requires periodic regeneration and monitoring.
Carbon filters do NOT remove nitrate
Standard pitcher filters, faucet filters, and under-sink carbon units — including those certified NSF/ANSI 42 or 53 — do not remove nitrate. Do not use these for nitrate reduction.
Frequently Asked Questions
Related Pages
Nitrate — National Overview
All U.S. utilities with nitrate records
Nevada State Overview
All utilities and water quality data
Lead in Drinking Water
A separate but common concern
Reverse Osmosis Guide
Removes 85–95% of nitrate
Well Water Guide
Private well testing and safety
All Contaminants
Complete reference library
Data Sources & Provenance
All data on this page is sourced from official U.S. government or public datasets.
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Nevada Division of Environmental Protection (NDEP) ↗