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County water report

Wicomico County Water Report

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

Water grade

F

Water score

39.2

State rank

#18

of 24

Health violations

16

EPA SDWIS, 5-year lookback

Watershed impaired

46.3%

41 water bodies assessed

Monitoring sites

34

19,427 recent measurements

Live streamflow

18%

POCOMOKE RIVER NEAR WILLARDS, MD

Water at a glance

Key Water Indicators for Wicomico County

EPA SDWIS

Safety Grade

F

Score: 39.2 / 100

EPA SDWIS

Active Violations

16

5-year health-based lookback

EPA ATTAINS

Watershed Health

46% impaired

41 bodies assessed

USGS NWIS

Streamflow Snapshot

18% of mean

POCOMOKE RIVER NEAR WILLARDS, MD

EPA WQP

Monitoring Sites

34

19,427 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

F

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

39.2/100

Health violations

16

Health-based violations

Violations per 100K served

33.8

Population-normalized SDWIS rate

Editorial analysis

Understanding Wicomico County’s Water

Drinking Water Quality Overview

EPA SDWIS

Wicomico County's water systems carry a failing grade, scoring 39.2 out of 100. Over the past five years, EPA SDWIS records 16 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 substantial 46.3% of assessed waterways are impaired (19 of 41 water bodies) across Wicomico County's watersheds. The leading impairment causes are phosphorus, total and nitrogen, total. 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 2026-05-14T14:45:00.000-04:00) puts POCOMOKE RIVER at 12.9 cfs — well below its long-term average at 18% 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. Wicomico County has moderate coverage with 34 active monitoring sites with 19,427 recent measurements on record. Predominant monitoring categories include physical and nutrient. 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 Wicomico County

Water Verdict

Wicomico County receives a poor water quality assessment with a grade of F and a score of 39.2 out of 100. The water supply has documented quality issues. Residents are strongly encouraged to use filtered or bottled water for drinking and to stay informed about utility improvement plans.

Violation Context

Wicomico County has recorded 16 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 33.8 violations per 100,000 people served, this rate is high and signals significant water quality management issues.

Consumer Guidance

Drinking-water compliance in Wicomico County is rated Grade F, reflecting significant health-based violations in the recent reporting period. Wicomico County's drinking-water compliance score is 39.2 out of 100. The violation rate for Wicomico County is 33.8 per 100,000 people served. An NSF 53 or NSF 58-certified filter is recommended for drinking and cooking water. Check the Consumer Confidence Report from your utility to identify the specific contaminants and required corrective actions — utilities are legally required to notify customers of violations. Phosphorus, Total is the leading impairment cause in Wicomico County's watershed. With 34 active water-quality monitoring sites in Wicomico County, data coverage is strong. A pipeline streamflow snapshot from the POCOMOKE RIVER gauge is also available on this page.

Regional Context

Wicomico County has poorer water quality than the average county in Maryland. Its water score is 11.3 points lower than the state average, suggesting more challenges with contamination control or infrastructure than neighboring counties.

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 Wicomico County's water environment

Watershed Impairment Causes (EPA ATTAINS)

  • 1

    Phosphorus (excess nutrients)

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

  • 2

    Nitrogen, Total

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

  • 3

    Total Suspended Solids (Tss)

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

Source: EPA ATTAINS · Reporting cycle 2022

Official EPA Resources for Wicomico County

EPA How's My Waterway

Interactive watershed health data for Wicomico County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Wicomico County

Consumer Confidence Reports (MD)

Annual water quality reports from utilities in Maryland

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

46.3%

19 of 41 assessed

Moderate concern

Top Impairment Causes

  • 1

    PHOSPHORUS, TOTAL

  • 2

    NITROGEN, TOTAL

  • 3

    TOTAL SUSPENDED SOLIDS (TSS)

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

34

Active in the past 5 years

Measurements Recorded

19K

19,427 total readings

Most Measured

  • Physical
  • Nutrient
  • Biological, Algae, Phytoplankton

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

12.9cfs

May 14, 6:45 PM UTC

vs Long-Term Average

18%

Well below typical

Primary Streamgage

POCOMOKE RIVER NEAR WILLARDS, MD

USGS site
01485000
Drainage area
60.5 sq mi
Long-term mean
73.0 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 Wicomico 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 Wicomico County, Maryland?
Wicomico County, Maryland has a drinking-water quality grade of F with a score of 39.2/100, based on EPA SDWIS compliance data. The county has 16 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 Wicomico County?
Wicomico County has 16 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 Wicomico County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 46.3% of Wicomico County's 41 assessed water bodies are classified as impaired (19 impaired). The top reported causes are PHOSPHORUS, TOTAL, NITROGEN, TOTAL, TOTAL SUSPENDED SOLIDS (TSS). 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 Wicomico County?
EPA's Water Quality Portal records 19,427 measurements from 34 monitoring sites in Wicomico County over the past five years. The most frequently measured characteristic groups are Physical, Nutrient, Biological, Algae, Phytoplankton. 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 Wicomico County right now?
Wicomico County's primary USGS streamgage on the POCOMOKE RIVER has a pipeline snapshot of 12.9 cubic feet per second — 18% of the long-term mean of 72.96 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 Wicomico County water compare to the Maryland average?
Wicomico County's SDWIS water quality score of 39.2/100 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 Wicomico County?
Based on EPA SDWIS data, Wicomico County has a water quality grade of F (39.2/100). 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 Wicomico County have so many water violations?
Wicomico County has 16 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 Wicomico County rank for water quality in Maryland?
Wicomico County ranks #18 out of 24 counties in Maryland by SDWIS water quality score (1 = best). With a score of 39.2/100, it falls in the bottom 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

Garrett County

Maryland

D

41.8

Water score

Queen Anne's County

Maryland

F

35.9

Water score

Kent County

Maryland

D

43.5

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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