Nitrate In Drinking Water In Mississippi
What residents of Mississippi 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, Mississippi State Department of Health (MSDH), CDC · Last reviewed: 2025-01-01
Quick Answer
Is nitrate in drinking water a real concern in Mississippi?
Yes — Mississippi's Delta region has intensive cotton, corn, and soybean farming, and the alluvial aquifer underlying the Delta is vulnerable to agricultural nitrate. Poultry operations elsewhere in the state also contribute nitrate loading.
Is this mostly a public-water issue, a private-well issue, or both?
Primarily private well users in the Delta and agricultural counties; some small public systems drawing from shallow alluvial groundwater may also be affected.
What is the main reason residents should care?
Mississippi's Delta — the alluvial floodplain of the Mississippi River in northwest Mississippi — has intensive row crop farming with heavy fertilizer use. The shallow alluvial aquifer underlying the Delta is vulnerable to agricultural contamination. Poultry operations in central and south Mississippi add further nitrate loading.
Key Facts
| EPA Nitrate MCL | 10 mg/L as N |
| Delta region | Intensive row crop farming on vulnerable shallow alluvial aquifer — elevated nitrate risk |
| Poultry counties | Central Mississippi poultry operations contribute additional nitrate from litter application |
| Private well risk | Delta counties and central MS poultry counties — annual testing recommended |
| State oversight | Mississippi State Department of Health (MSDH) |
Why This Matters in Mississippi
The Mississippi Delta is one of the most productive agricultural regions in the nation, producing cotton, soybeans, corn, and rice under intensive cultivation. The shallow alluvial aquifer underlying the Delta floodplain is recharged quickly from the surface and is vulnerable to agricultural contamination. Poultry production in counties like Scott, Simpson, and Smith in central Mississippi generates additional nitrate from litter application. Mississippi's rural character means many households rely on private wells without regulatory oversight for water quality. MSDH monitors public water systems for nitrate compliance and provides private well guidance.
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.
Mississippi 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.
City of Jackson
Jackson · 189,673 served
City of Gulfport
Gulfport · 75,056 served
City of Olive Branch
Olive Branch · 54,025 served
City of Hattiesburg
Hattiesburg · 43,449 served
City of Tupelo
Tupelo · 37,000 served
City of Starkville
Starkville · 32,027 served
City of Brandon
Brandon · 31,852 served
City of Flowood
Mississippi · 31,574 served
City of Greenville
Mississippi · 29,602 served
City of Vicksburg
Mississippi · 29,238 served
How Nitrate Gets Into Drinking Water
Agricultural fertilizer and manure runoff
Nitrogen-based fertilizers and animal waste applied to Mississippi 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 the Mississippi Delta (Bolivar, Sunflower, Washington, Humphreys Counties) and central Mississippi poultry counties should test for nitrate annually. Families with infants relying on private well water should test before formula preparation.
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 Mississippi
- 1
Identify your water utility. Use the ZIP lookup below or browse the Mississippi 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 Mississippi State Department of Health (MSDH)-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
Mississippi 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
State Regulator
Mississippi State Department of Health (MSDH) ↗