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Maryland / Waters /

Seneca Creek

River in Maryland, past Darnestown, Gaithersburg and Poolesville

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.

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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 Seneca Creek

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: 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 Seneca Creek

Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater.

Reports linked to Seneca Creek, newest first
WhenReportStatus
to 5:00 PMWssc · 110 Odendhal Avenue · SSO · 372 gallons report · notice · mapended
to 5:35 PMWssc · 110 Odenhal Avenue · SSO · 468 gallons report · notice · mapended
to 11:00 PMWssc · 19137 St. Johnsbury Lane · SSO · 119 gallons report · notice · mapended
to 10:30 PMWssc · 13421 Clopper Rd. · SSO · 652 gallons report · notice · mapended
to Jan 22 ’25, 10:30 AMWssc · 9523 Tippett Lane · SSO · 1,610 gallons report · notice · mapended
to Dec 4 ’24, 4:00 AMWssc · 8500 Shady Pine · SSO · 106 gallons report · notice · mapended
to Oct 11 ’23, 12:00 PMCity of Rockville · 15100 Frederick Rd · SSO · 400 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

All reports in Maryland by year: 2026 (2 here) · 2025 (3 here) · 2024 (1 here) · 2023 (1 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). · Seneca Creek on OpenBoatLaunch

Nearby waters

Sources covering this water

7 records linked to this water. Updated .