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County water report

Allegany County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Allegany County, Maryland.

Water grade

D

Water score

48.6

State rank

#13

of 24

Health violations

12

EPA SDWIS, 5-year lookback

Watershed impaired

24.3%

115 water bodies assessed

Monitoring sites

31

15,478 recent measurements

Live streamflow

27%

POTOMAC RIVER AT PAW PAW, WV

Water at a glance

Key Water Indicators for Allegany County

EPA SDWIS

Safety Grade

D

Score: 48.6 / 100

EPA SDWIS

Active Violations

12

5-year health-based lookback

EPA ATTAINS

Watershed Health

24% impaired

115 bodies assessed

USGS NWIS

Streamflow Snapshot

27% of mean

POTOMAC RIVER AT PAW PAW, WV

EPA WQP

Monitoring Sites

31

15,478 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

D

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

48.6/100

Health violations

12

Health-based violations

Violations per 100K served

18.3

Population-normalized SDWIS rate

Editorial analysis

Understanding Allegany County’s Water

Drinking Water Quality Overview

EPA SDWIS

Allegany County's drinking water received a D grade, scoring 48.6 out of 100. Over the past five years, EPA SDWIS records 12 health-based violations — a pattern that public water utilities are required to disclose and correct.

Watershed Conditions

EPA ATTAINS

Under the Clean Water Act §303(d), EPA ATTAINS tracks whether waterways meet quality standards for drinking, recreation, and aquatic life (reporting cycle: 2022). A notable 24.3% of assessed waterways carry an impairment designation (28 of 115 water bodies) across Allegany County's watersheds. The leading impairment causes are ph, low and temperature. Impairment does not mean tap water is unsafe — it measures ambient waterway conditions upstream of treatment, not finished drinking water.

River & Streamflow Status

USGS NWIS

USGS NWIS gauge data (as of 2026-05-14T14:15:00.000-04:00) puts POTOMAC RIVER at 916.0 cfs — well below its long-term average at 27% of mean — low-flow conditions worth noting for water-dependent ecosystems. Streamflow is a leading indicator of drought stress, sediment load, and dilution capacity: low flows concentrate pollutants and warm water temperatures, stressing aquatic life and, in surface-water-dependent systems, the source water quality for treatment plants.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. Allegany County has moderate coverage with 31 active monitoring sites with 15,478 recent measurements on record. Predominant monitoring categories include nutrient and physical. More monitoring sites generally indicate greater scientific attention to local water conditions — and provide the baseline data that regulators use to set future impairment listings.

Editorial advisory

What the data suggests for Allegany County

Water Verdict

Allegany County receives a below-average water quality assessment with a grade of D and a score of 48.6 out of 100. Residents should review their utility's Consumer Confidence Report and may want to consider additional water filtration for drinking.

Violation Context

Allegany County has recorded 12 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 18.3 violations per 100,000 people served, this rate is high and signals significant water quality management issues.

Consumer Guidance

Allegany County's drinking-water compliance is below average with a Grade D, indicating repeated or unresolved violations in the recent record. Allegany County's drinking-water compliance score is 48.6 out of 100. The violation rate for Allegany County is 18.3 per 100,000 people served. Residents are encouraged to use an NSF 53 or NSF 58-certified filter for drinking and cooking water until the underlying violations are resolved. Running tap water for 30 seconds before use and avoiding older lead-pipe connections can also reduce exposure risk. The current Consumer Confidence Report from your utility will specify the contaminants of concern. Ph, Low is the leading impairment cause in Allegany County's watershed. With 31 active water-quality monitoring sites in Allegany County, data coverage is strong. A pipeline streamflow snapshot from the POTOMAC RIVER gauge is also available on this page.

Regional Context

Allegany County has water quality close to the average county in Maryland. Its water score is within 1.9 points of the state average, meaning its overall water system performance is broadly representative of Maryland as a whole.

Advisory text summarizes county-level public records and is not a replacement for your utility's current Consumer Confidence Report or direct local notices.

Contaminants & Resources

Key issues flagged in Allegany County's water environment

Watershed Impairment Causes (EPA ATTAINS)

  • 1

    Ph, Low

    Impairment cause per EPA Clean Water Act §303(d) assessment

  • 2

    Elevated temperature

    Impairment cause per EPA Clean Water Act §303(d) assessment

  • 3

    Cause Unknown

    Impairment cause per EPA Clean Water Act §303(d) assessment

Source: EPA ATTAINS · Reporting cycle 2022

Official EPA Resources for Allegany County

EPA How's My Waterway

Interactive watershed health data for Allegany County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Allegany County

Consumer Confidence Reports (MD)

Annual water quality reports from utilities in Maryland

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

24.3%

28 of 115 assessed

Some impairment

Top Impairment Causes

  • 1

    PH, LOW

  • 2

    TEMPERATURE

  • 3

    CAUSE UNKNOWN

Source: EPA ATTAINS · Reporting cycle 2022

Impairment is determined under the Clean Water Act §303(d): a water body is impaired when it fails to meet state-defined quality standards for designated uses (drinking, recreation, aquatic life). Assessment coverage varies by state; counties without assessed water bodies are not shown.

Past 5 years

Water Quality Monitoring

Monitoring Sites

31

Active in the past 5 years

Measurements Recorded

15K

15,478 total readings

Most Measured

  • Nutrient
  • Physical
  • Organics, Other

Categories measured most frequently

Data from the EPA Water Quality Portal (WQP), aggregating monitoring records from federal, state, and tribal sources. Each measurement represents a single sample analyzed for a specific characteristic (e.g., E. coli, pH, dissolved oxygen, nitrogen).

Live USGS Streamgage

River & Stream Conditions

Current Discharge

916cfs

May 14, 6:15 PM UTC

vs Long-Term Average

27%

Well below typical

Primary Streamgage

POTOMAC RIVER AT PAW PAW, WV

USGS site
01610000
Drainage area
3,129 sq mi
Long-term mean
3,391 cfs

One representative streamgage (the one with the largest drainage area in the county). Many counties have multiple gauges; this view summarizes the primary one. The long-term mean is the full-record annual average; the percent-of-typical value compares the latest reading against that average.

Free tool

Estimate Your Water Costs

Water Cost Estimate

3

3 people  ·  ~225 gal/day

Annual Total

$558

Monthly

$47

Water Bill

$558/yr

Filter Cost

$0/yr

Safety Grade for Allegany County:C — Moderate

Some violations or watershed impairment detected.

Estimates use the national average residential water rate ($0.0068/gal, EPA/AWWA 2023) and EPA WaterSense per-person consumption baseline (75 gal/person/day). Actual bills vary by utility, usage tier, and local infrastructure fees. For informational purposes only.

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Frequently Asked Questions

What is the water quality in Allegany County, Maryland?
Allegany County, Maryland has a drinking-water quality grade of D with a score of 48.6/100, based on EPA SDWIS compliance data. The county has 12 health-based drinking water violations over the past 5 years. Watershed health, monitoring records, and streamflow snapshots are reported separately on this page.
Are there any water violations in Allegany County?
Allegany County has 12 health-based drinking water violations recorded by the EPA over the past 5 years. Health-based violations indicate instances where contaminant levels exceeded EPA Maximum Contaminant Levels (MCLs). Violations may have been resolved — check with your local water utility for current status.
How healthy are the watersheds in Allegany County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 24.3% of Allegany County's 115 assessed water bodies are classified as impaired (28 impaired). The top reported causes are PH, LOW, TEMPERATURE, CAUSE UNKNOWN. Impairment means the water body fails to meet state quality standards for at least one designated use — drinking water source, recreation, aquatic life, or fish consumption. Note: watershed impairment doesn't always translate to tap-water issues; treatment plants can remove most regulated contaminants.
How much water-quality monitoring happens in Allegany County?
EPA's Water Quality Portal records 15,478 measurements from 31 monitoring sites in Allegany County over the past five years. The most frequently measured characteristic groups are Nutrient, Physical, Organics, Other. Each measurement is a single sample analyzed for one characteristic (E. coli, pH, dissolved oxygen, etc.). High monitoring density means more scientific evidence behind any reported signal — it does not by itself indicate water quality.
What's happening with rivers in Allegany County right now?
Allegany County's primary USGS streamgage on the POTOMAC RIVER has a pipeline snapshot of 916 cubic feet per second — 27% of the long-term mean of 3,390.61 cfs. This is well below typical — often a signal of drought stress on source water. For the latest gauge feed, visit waterdata.usgs.gov.
How does Allegany County water compare to the Maryland average?
Allegany County's SDWIS water quality score of 48.6/100 is lower than the Maryland state average of 50.5. The average water quality grade across Maryland is D, based on data from 24 counties with available SDWIS data.
Is tap water safe to drink in Allegany County?
Based on EPA SDWIS data, Allegany County has a water quality grade of D (48.6/100). This indicates below-average compliance with significant violations. Residents may want to consider home water filtration or independent testing. The grade speaks to the public water system, not the watershed — for watershed-level concerns, see the Watershed Health zone. For the most up-to-date information, contact your local water utility or review your Consumer Confidence Report (CCR).
Why does Allegany County have so many water violations?
Allegany County has 12 health-based drinking water violations on record from the EPA SDWIS database. A higher violation count can result from aging infrastructure, underfunded water utilities, agricultural runoff contamination, or industrial pollution. Counties with more water systems may also see more violations simply due to scale. Residents concerned about water quality should consider independent water testing and home filtration systems.
How does Allegany County rank for water quality in Maryland?
Allegany County ranks #13 out of 24 counties in Maryland by SDWIS water quality score (1 = best). With a score of 48.6/100, it falls in the middle third of counties statewide. The ranking reflects EPA SDWIS compliance only — not watershed impairment, monitoring density, or streamflow, which are tracked separately on this page.

Counties with Similar Water Quality

Dorchester County

Maryland

D

47.7

Water score

Calvert County

Maryland

D

50.0

Water score

Worcester County

Maryland

D

46.7

Water score

Data Sources

Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Watershed health and impaired-waterway data from the EPA ATTAINS Clean Water Act §303(d) assessments, state-reported and EPA-finalized.

Water-quality monitoring counts from the EPA Water Quality Portal (WQP), federated USGS, EPA, and state agency sampling records over a rolling 5-year window.

Live streamflow from the USGS National Water Information System (NWIS), continuous discharge measurements from the largest-drainage gauge in each county, compared against the full-record long-term annual mean.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

By Evan Brooks, Data EditorUpdated Reviewed by Evan Brooks, Data Editor

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