Nitrate In Drinking Water In Missouri
What residents of Missouri 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, Missouri Department of Natural Resources (MDNR), CDC · Last reviewed: 2025-01-01
Quick Answer
Is nitrate in drinking water a real concern in Missouri?
Yes — Missouri's agricultural regions and its extensive karst geology in the Ozarks create documented nitrate concerns in private wells and some public systems.
Is this mostly a public-water issue, a private-well issue, or both?
Primarily private well users in agricultural and karst-terrain counties; public water systems drawing from springs in the Ozarks also require vigilance given the karst's rapid contamination pathways.
What is the main reason residents should care?
Missouri has significant corn, soybean, hog, and cattle production. The Ozark karst geology creates fast underground pathways for agricultural and septic nitrate to reach groundwater — including springs that serve some rural public water systems.
Key Facts
| EPA Nitrate MCL | 10 mg/L as N |
| Ozark karst | Cave and spring systems create fast underground pathways for agricultural nitrate |
| Agricultural sources | Corn, soybeans, hogs, and cattle across north and west Missouri |
| Spring-fed systems | Some Missouri rural water systems draw from springs — require nitrate monitoring |
| State oversight | Missouri Department of Natural Resources (MDNR) |
Why This Matters in Missouri
Missouri is a major agricultural state, producing significant corn, soybeans, hogs, and cattle. The Missouri River basin in north and west Missouri has intensive row crop farming. The Ozark Plateau in south-central Missouri overlies karst limestone, and the state has extensive cave and spring systems — including the headwaters of large springs used by some public water systems. Agricultural and septic nitrogen entering sinkholes or karst features can travel underground quickly and emerge in springs used for drinking water. MDNR enforces nitrate standards for public systems and provides private well testing guidance. Some Missouri community water systems draw from springs, requiring monitoring for agricultural nitrate.
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.
Missouri Utilities With Nitrate Violation Records
The utilities listed below have at least one nitrate violation on record in EPA's SDWIS database. Violations may be open or resolved — see individual utility pages for current status and risk level.
Independence Pws
Independence · 120,000 served
Lees Summit Pws
Lees Summit · 99,400 served
St Charles Pws
St. Charles · 73,040 served
Blue Springs Pws
Blue Springs · 61,084 served
St Peters Pws
St. Peters · 52,575 served
Gladstone Pws
Gladstone · 27,000 served
Belton Pws
Belton · 23,598 served
Ozark Pws
Ozark · 22,000 served
Sedalia Pws
Sedalia · 21,725 served
Rolla Pws
Rolla · 20,800 served
How Nitrate Gets Into Drinking Water
Agricultural fertilizer and manure runoff
Nitrogen-based fertilizers and animal waste applied to Missouri 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 Missouri's north and west agricultural regions and in Ozark karst counties should test for nitrate annually. Residents served by spring-fed rural water systems in the Ozarks should check their CCR for recent nitrate monitoring results.
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 Missouri
- 1
Identify your water utility. Use the ZIP lookup below or browse the Missouri 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 Missouri Department of Natural Resources (MDNR)-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
Missouri 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.
Find Your Utility
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Missouri Department of Natural Resources (MDNR) ↗