Nitrate In Drinking Water In Maryland
What residents of Maryland 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, Maryland Department of the Environment (MDE), CDC · Last reviewed: 2025-01-01
Quick Answer
Is nitrate in drinking water a real concern in Maryland?
Yes — Maryland's Eastern Shore has intensive poultry and row crop production, and private well users in Eastern Shore counties have documented elevated nitrate from agricultural sources.
Is this mostly a public-water issue, a private-well issue, or both?
Primarily private well users in the Eastern Shore counties; public water systems are monitored by MDE, but rural Eastern Shore households relying on private wells face elevated nitrate risk.
What is the main reason residents should care?
Maryland's Eastern Shore — Cecil, Kent, Queen Anne's, Talbot, Caroline, Dorchester, Wicomico, Worcester, and Somerset Counties — has very high concentrations of poultry operations and row crop farming. This region's sandy coastal plain soils allow rapid nitrate percolation to shallow aquifers used by private wells.
Key Facts
| EPA Nitrate MCL | 10 mg/L as N |
| Eastern Shore context | High-density poultry operations — litter applied to sandy soils rapid-percolates to shallow aquifer |
| Chesapeake Bay requirement | Maryland must reduce agricultural nitrogen loading to the Bay — acknowledging scale of the issue |
| Highest-risk counties | Worcester, Wicomico, Dorchester — agricultural intensity plus shallow coastal plain aquifer |
| State oversight | Maryland Department of the Environment (MDE) |
Why This Matters in Maryland
Maryland's Eastern Shore is one of the most poultry-intensive agricultural regions on the East Coast, with a very high density of chicken broiler operations. Poultry litter applied to cropland on the Eastern Shore's sandy coastal plain soils can rapidly move nitrate to the shallow aquifer. Maryland is also a Chesapeake Bay jurisdiction with significant agricultural nutrient management requirements — acknowledging the scale of nitrogen loading from Eastern Shore farming. MDE monitors public water systems for nitrate compliance. Private well users on the Eastern Shore — particularly in Worcester, Wicomico, and Dorchester Counties — 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.
Maryland 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.
Glen Burnie-broadneck
Maryland · 290,606 served
Howard County D.p.w. Distribution
Maryland · 286,158 served
Crofton-odenton
Maryland · 62,986 served
City of Frederick
Frederick · 54,000 served
City of Annapolis
Annapolis · 35,000 served
City of Salisbury
Maryland · 30,343 served
City of Cumberland
Maryland · 27,039 served
Broad Creek
Maryland · 26,033 served
Town of Elkton
Maryland · 15,625 served
City of Cambridge Water
Maryland · 15,000 served
How Nitrate Gets Into Drinking Water
Agricultural fertilizer and manure runoff
Nitrogen-based fertilizers and animal waste applied to Maryland 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 Maryland's Eastern Shore counties should test for nitrate annually. Families with infants using private well water on the Eastern Shore should use current test results before preparing formula.
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 Maryland
- 1
Identify your water utility. Use the ZIP lookup below or browse the Maryland 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 Maryland Department of the Environment (MDE)-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
Maryland 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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Maryland Department of the Environment (MDE) ↗