waterbycounty
EPA SDWIS

Falls Church city Water Quality

Falls Church city, Virginia

Water Grade

N/A

Water Score

N/A

Violations

N/A

State Rank

N/A

EPA SDWIS Compliance

Drinking Water Quality

Water Advisory: Falls Church city

Water Verdict

Falls Church city does not have sufficient EPA SDWIS water quality data to determine an overall assessment. Residents should contact their local water utility for the most recent Consumer Confidence Report.

Violation Context

Health-based violation data is not available for Falls Church city. EPA health violations occur when water systems exceed allowable contaminant levels or fail to meet treatment requirements. Residents should request the latest Consumer Confidence Report from their water provider.

Consumer Guidance

Residents of Falls Church city should obtain the annual Consumer Confidence Report from their water utility, which lists detected contaminants and any violations. Even without available data, using a NSF-certified water filter can provide additional peace of mind for drinking water.

Regional Context

State-level water quality comparison data is not available for Falls Church city. When data is available, this section will show how the county's water quality compares to other counties in Virginia.

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

50.0%

2 of 4 assessed

Moderate concern

Top Impairment Causes

  • 1

    BENTHIC MACROINVERTEBRATES BIOASSESSMENTS

  • 2

    ESCHERICHIA COLI (E. COLI)

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.

Live USGS Streamgage

River & Stream Conditions

Current Discharge

0.10cfs

May 14, 7:00 PM UTC

vs Long-Term Average

11%

Well below typical

Primary Streamgage

FOUR MILE RUN AT HWY 29 AT FALLS CHURCH, VA

USGS site
01652090
Drainage area
0.932 sq mi
Long-term mean
0.91 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; "% of typical" compares the latest reading against that average.

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Frequently Asked Questions

What is the water quality in Falls Church city, Virginia?
Falls Church city, Virginia has a drinking-water quality grade of N/A with a score of N/A/100, based on EPA SDWIS compliance data. Compliance data is currently unavailable. Watershed health, monitoring records, and live streamflow are reported separately on this page.
Are there any water violations in Falls Church city?
Violation data for Falls Church city is not currently available. Health-based violations indicate instances where contaminant levels exceeded EPA Maximum Contaminant Levels (MCLs).
How healthy are the watersheds in Falls Church city?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 50.0% of Falls Church city's 4 assessed water bodies are classified as impaired (2 impaired). The top reported causes are BENTHIC MACROINVERTEBRATES BIOASSESSMENTS, ESCHERICHIA COLI (E. COLI). 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.
What's happening with rivers in Falls Church city right now?
Falls Church city's primary USGS streamgage on the FOUR MILE RUN is currently reading 0.1 cubic feet per second — 11% of the long-term mean of 0.91 cfs. This is well below typical — often a signal of drought stress on source water. For genuine real-time data, visit waterdata.usgs.gov.
How does Falls Church city water compare to the Virginia average?
Falls Church city's SDWIS water quality score of N/A/100 is not available for comparison. The average water quality grade across Virginia is D, based on data from 95 counties with available SDWIS data.
Is tap water safe to drink in Falls Church city?
Based on EPA SDWIS data, Falls Church city has a water quality grade of N/A (N/A/100). Insufficient data is available to fully assess compliance. 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).
Does Falls Church city have clean drinking water?
Falls Church city has no reported health-based drinking water violations according to EPA records. With a water quality score of N/A/100 and grade N/A, the county's drinking water has had some compliance issues but continues to be monitored. Note: drinking-water compliance speaks to the public water system, not necessarily to the watershed itself — check the Watershed Health zone for ATTAINS §303(d) data.
How is water quality measured?
WaterByCounty layers four federal datasets per county. The A–F drinking-water grade comes from EPA SDWIS (Safe Drinking Water Act compliance, 5-year violation lookback). The Watershed Health zone surfaces EPA ATTAINS §303(d) impairment data. The Monitoring zone summarizes EPA Water Quality Portal records. The Streamflow zone reports the latest USGS NWIS reading from the county's primary streamgage. Each is reported separately so you can see where the water is actually weakest.

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, EPA-finalized.

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 Logan Johnson, Founder & Data EditorUpdated Reviewed by Logan Johnson, Founder & Data Editor

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