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Maryland / Waters /

Potomac River

River in Maryland, past Accokeek, Antietam, Big Pool, Brunswick, Bryans Road, Clear Spring, Colton's Point, Coltons Point, Dickerson, Ernstville, Four Locks and Hancock

Current status

No current status shown

No current status is assigned to this water outline. Check the water page for reports and any estimated downstream stretches. Why this status, and its source

This badge describes the water outline. Check the downstream stretches on the map and below for discharge statuses.

Map sources: water outlines and launches from OpenBoatLaunch and OpenStreetMap contributors (Open Database License); wastewater outlets from EPA and state records; downstream estimates by DirtyWaterWatch using U.S. Geological Survey maps and flow data. Base map: OpenFreeMap and OpenMapTiles.

Square boat markers mark boat launches listed by OpenBoatLaunch. Outlined boat markers are marinas and clubs: not public access.

Upstream and downstream

Potomac River is tracked as one record per state. Listed from north to south.

  1. Potomac River, DC No current status shown · 0 discharges setting a status now · latest report
  2. Potomac River, MD (this page) No current status shown · 0 discharges setting a status now · latest report
  3. Potomac River, VA No current status shown · 0 discharges setting a status now · latest report

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About this status

No current status shown: no report we track sets a status on this water now; how statuses work

Sources checked: MDE Reported Sewer Overflows (New for 2023), Maryland Open Data Portal (Socrata stgj-u72u) (last successful check 2026-11-03 02:31 UTC). Status by DirtyWaterWatch, updated 2026-11-03 02:43 UTC. · Updated

Estimated downstream stretches on Potomac River

No downstream stretch has a current status here as of Nov 2, 2026, 9:43 PM EST. Check the reports below.

The last 90 days

Last 90 days, hour by hour. Red: discharge or advisory reported. Amber: caution. Hatched amber: end not confirmed. Grey: no current status on the water outline. Purple hatching: source update overdue.
  • Caution: to
    1 report: WSSC 1
    Show records

    The records are also in the report table on this page.

  • Discharge or advisory reported: to
    1 report: WSSC 1
    Show records

    The records are also in the report table on this page.

  • Caution: to
    1 report: Town of Hancock 1
    Show records

    The records are also in the report table on this page.

  • Discharge or advisory reported: to
    1 report: Town of Hancock 1
    Show records

    The records are also in the report table on this page.

  • Caution: to
    2 reports: Mayor and City Council of Cumberland 1, WSSC 1
    Show records

    The records are also in the report table on this page.

  • Discharge or advisory reported: to
    1 report: Mayor and City Council of Cumberland 1
    Show records

    The records are also in the report table on this page.

  • Caution: to
    1 report: WSSC 1
    Show records

    The records are also in the report table on this page.

  • Discharge or advisory reported: to
    1 report: WSSC 1
    Show records

    The records are also in the report table on this page.

Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-03 02:43 UTC.

Reported discharges over time

Historical charts are not available here. See the reports and sources on this page.

Reports linked to Potomac River

Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater. Combined sewer overflow (CSO): sewage mixed with rainwater spills from a shared sewer system. Treatment bypass: wastewater skips one or more treatment steps.

Reports linked to Potomac River, newest first
WhenReportStatus
to 3:00 PMWssc · Not Sewage · SSO · 0 gallons report · notice · mapended
to 7:45 AMTown of Hancock · 4 Fleming Court · SSO · 500 gallons report · notice · mapended
to 10:38 AMMayor and City Council of Cumberland · 9 CSO locations · CSO · 190,800 gallons report · notice · mapended
to 9:17 AMWssc · 522 W Tantallon Dr · SSO · 150,300 gallons report · notice · mapended
to 10:25 PMDC Water · Clara Barton Parkway · SSO · 600,000 gallons report · notice · mapended
to 8:15 AMTown of Hancock · Flaming Court · SSO · 600 gallons report · notice · mapended
DC Water · SSO · 280 million gallons report · notice · mapreported
to 11:15 AMTown of Hancock · 4 Fleming Ct · SSO · 200 gallons report · notice · mapended
to 4:15 PMTown of Hancock · 280 Pennsylvania Avenue · SSO · 1,000 gallons report · notice · mapended
to Nov 4 ’25, 11:30 AMAllegany County DPW · Canal Place · SSO · 13,000 gallons report · notice · mapended
to 8:39 PMCity of Brunswick · Concord Drive · SSO · volume not reported report · notice · mapended
to Jun 22 ’25, 11:05 PMWssc · 12200 River Rd · SSO · volume not reported report · notice · mapended
to Jun 3 ’25, 2:00 PMTown of Westernport · Main Street · SSO · volume not reported report · notice · mapended
to May 15 ’25, 6:00 AMTown of Hancock · East Main Street, Route #40 · SSO · 10,000 gallons report · notice · mapended
to May 15 ’25, 8:00 AMTown of Hancock · Route 40 · SSO · 15,000 gallons report · notice · mapended
to May 31 ’25, 6:00 PMAllegany County DPW · 701 Kelly Road · SSO · volume in each report mapended
to May 19 ’25, 8:00 AMMaryland Water Service Utilities, Inc. · Route #220 South(McMullen Highway) · Bypass · 2.7 million gallons report · notice · mapended
to Nov 21 ’24, 3:00 PMTown of Westernport · Cosgrove Lane · SSO · volume not reported report · notice · mapended
to 1:30 PMTown of Hancock · Virginia Avenue · SSO · 3,000 gallons report · notice · mapended
to Apr 9 ’24, 8:00 AMMaryland Water Service Utilities, Inc. · Route #220 East · Bypass · volume not reported report · notice · mapended
to 10:00 AMTown of Hancock · 53 East Main Street · SSO · 1,000 gallons report · notice · mapended
to 4:00 PMSt. Mary's County Metropolitan Commission · 16384 Ball Point Road · SSO · 43,070 gallons report · notice · mapended
to 4:00 PMTown of Hancock · Route 40 & Center Street · SSO · 50 gallons report · notice · mapended
to Aug 29 ’23, 5:00 PMU.S. Navy · Intersection of Ward Rd and Tisdale Rd, Indian Head, MD 20640 · SSO · 3.5 million gallons report · notice · mapended

Sources: MDE Reported Sewer Overflows (New for 2023), Maryland Open Data Portal (Socrata stgj-u72u), retrieved 2026-11-03 02:31 UTC. A report's record id and times show when you hover or focus its "report" link.

Download these reports as CSV

Showing the latest 25 records of 31 records.See them all with filters.

All reports in Maryland by year: 2026 (9 here) · 2025 (9 here) · 2024 (6 here) · 2023 (7 here)

Wastewater outlets on this water

Outfall: a pipe or outlet where wastewater enters a water body.

No wastewater outlet in our records is linked to this water.

Boat launches

Source: OpenBoatLaunch launch records (public agency data and OpenStreetMap, Open Database License). · Potomac River on OpenBoatLaunch

Marinas and clubs on this water

Marina or club: not public access.

Nearby waters

Sources covering this water

31 records linked to this water. Updated .