DirtyWaterWatch Public waters. Public record.

Maryland / Sewer operators /

Maryland Environmental Service (state-run plants)

Wastewater treatment plant · Maryland · various

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.

No outlet locations are in our records for this operator. Square boat markers mark boat launches listed by OpenBoatLaunch.

Federal wastewater discharge permit (NPDES)
MD0023868, MD0023922
Wastewater outlets
None with locations in our records
Waters listed as receiving wastewater
Dorsey Run; Wapti Creek
Tracked waters
Dorsey Run, MD, Antietam Creek, MD, Rocky Gap Run, MD, Lake Habeeb, MD, Little Beaver Creek, MD, North Branch Potomac River, MD, Greenbrier Lake, MD
Discharge records counted
30 records · latest
Total reported volume in these records
5,127,465 gallons across the 29 records that give a volume (1 without one)

These totals reflect the records we track. Missing volumes and gaps in reporting limit comparisons between operators.

Sources: EPA ECHO and the operator and state sources linked below. Counts use the discharge records on this page. Updated 2026-11-03 08:50 UTC.

Public notices and alerts

Pages where Maryland Environmental Service (state-run plants) or the state publishes its notices (check them for an alert sign-up):

Source: Maryland Environmental Service (state-run plants)'s public notice and alert pages and the state's notification records.

Report a missing notice or error

Wastewater outlets

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

Reports and advisories

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

Reports linked to Maryland Environmental Service (state-run plants), newest first
WhenReportStatus
to 11:40 AM“Wapti Creek” · 4395 Turkey Point Road Elkneck Park · SSO · 500 gallons report · noticeended
to Jul 11, 11:30 AMDorsey Run · 7938 Rockbridge Rd · Bypass · 320,000 gallons report · notice · mapended
to 1:30 PM“N/A” · 13699 Hanover Pike · SSO · 500 gallons report · notice · mapended
to 11:40 AMAntietam Creek · 18901 Roxbury Road · SSO · 750 gallons report · notice · mapended
to 11:00 PM“Open field east of the institution.” · Roxbury Correctional Institution · SSO · 200,000 gallons report · noticeended
to Apr 2, 9:30 AM“none” · 7938 Brock Bridge Rd · Bypass · 600,000 gallons report · noticeended
to 10:45 AMRocky Gap Run · 16401 Gorge Road, NE · SSO · 15 gallons report · notice · mapended
to Mar 17, 12:30 PM“none” · 7938 Brock Bridge Rd · Bypass · 750,000 gallons report · noticeended
to 6:30 PM“None.” · 11175 Point Lookout Rd · SSO · 2,500 gallons report · noticeended
to 10:30 AM“SSO was containd within the WWTP” · SSO · 900 gallons report · noticeended
to 9:40 PM“middle of solar panel field” · MCI - Solar Field Block #3 · SSO · 240,000 gallons report · noticeended
to Nov 12 ’25, 8:30 AMDorsey Run · 7938 Brock Bridge Rd · Bypass · 1 million gallons report · notice · mapended
to 8:30 PMLake Habeeb · 16401 Gorge · SSO · 100 gallons report · notice · mapended
to May 17 ’25, 11:30 AM“Friends Creek” · 17131 Bentzel Road · Bypass · 145,000 gallons report · notice · mapended
to May 15 ’25, 1:00 PMLittle Beaver Creek · 21843 National Pike · Bypass · 59,100 gallons report · notice · mapended
to May 14 ’25, 10:00 AMNorth Branch Potomac River · 376 McAndrews Hill Road · SSO · 1,000 gallons report · notice · mapended
to 1:28 PM“N/A” · 18901 Roxbury Road · SSO · 8,800 gallons report · noticeended
to 8:15 AM“An estimated 3,000 gallons of sewage overflowed the EQ Basin at the WWTP and pooled on the surrounding asphalt and concrete.” · 29449 Charlotte Hall RD · SSO · 3,000 gallons report · noticeended
to Jun 22 ’24, 10:00 AM“none” · 7938 Brock Bridge Road · Bypass · 1.21 million gallons report · noticeended
to Jun 19 ’24, 1:00 PM“Storm Water Retention Pond” · 29449 Charlotte Hall Rd · SSO · 90,000 gallons report · noticeended
to 2:45 PMAntietam Creek · 18901 Roxbury Road · SSO · 275,000 gallons report · notice · mapended
to Mar 10 ’24, 4:00 AMLittle Beaver Creek · 21843 National Pike · Bypass · 11,000 gallons report · notice · mapended
to 2:00 PM“None.” · 1301 Raincliffe Rd · SSO · 500 gallons report · noticeended
to 7:30 PM“N/A” · 18701 Roxbury Road · SSO · 124,000 gallons report · notice · mapended
to Feb 15 ’24, 8:00 AM“Unknown.” · 1520 Crownsville Rd · SSO · volume not reported report · notice · mapended

Sources: MDE Reported Sewer Overflows (New for 2023), Maryland Open Data Portal (Socrata stgj-u72u), retrieved 2026-11-03 08:17 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 30 records.See them all with filters.

All reports in Maryland by year: 2026 (10 from Maryland Environmental Service (state-run plants)) · 2025 (8 from Maryland Environmental Service (state-run plants)) · 2024 (8 from Maryland Environmental Service (state-run plants)) · 2023 (4 from Maryland Environmental Service (state-run plants))

Other sewer operators on these waters

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.

No discharge, advisory or caution periods are shown for the waters this sewer operator's reports were placed on in this time span. Check downstream stretches and source coverage.

Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-03 08:50 UTC.

Reported discharges over time

  • Discharges reported by Maryland Environmental Service (state-run plants), last 12 months11December 2025 to November 2026Verified reports where available, else notices; revisions and duplicates counted once.
  • Days with a discharge reported by Maryland Environmental Service (state-run plants), last 12 months14December 2025 to November 2026A day counts once however many discharges were under way on it. Verified reports where available, else notices; revisions and duplicates counted once.
  • Hours with a discharge or advisory status from Maryland Environmental Service (state-run plants)'s reports, last 12 months79December 2025 to November 2026Red hours by the map's rules: each discharge to its reported end plus the state's post-discharge period; overlapping hours count once.
  • 2026 season with a discharge or advisory status (Maryland Environmental Service (state-run plants))0.4%May to October 2026Share of May 1 to October 31 hours with red status by the map's rules, of the hours a source covered.

Combined sewer overflow (CSO): sewage mixed with rainwater spills from a shared sewer system. Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater. Treatment bypass: wastewater skips one or more treatment steps. Blended discharge: wastewater that skipped some treatment is mixed with treated wastewater. Outfall: a pipe or outlet where wastewater enters a water body.

Reported discharges per month

30 reported discharges, January 2022 to November 2026.

  • Combined sewer overflow
  • Sanitary sewer overflow
  • Treatment bypass, blended or other
  • No tracked source for this period
  • Incomplete source coverage
No tracked source

No tracked source covers January 2022 to December 2022.

Source: md-mde-overflows. Records cover January 4, 2023 to November 3, 2026.

Show table

Hours with a discharge or advisory status per month

Hours when a water had a discharge or advisory status from this sewer operator's reports, under DirtyWaterWatch rules.

  • Discharge or advisory reported
  • No tracked source for this period
  • Incomplete source coverage
No tracked source

No tracked source covers January 2022 to December 2022. Official beach and cyanobacteria (harmful blue-green algae) advisories are counted on water pages only.

Source: md-mde-overflows. Records cover January 4, 2023 to November 3, 2026.

Show table

Days with a reported discharge per month

A day counts when any counted discharge was under way on it, from its start to its reported end in Eastern Time; a report with no end counts its start day.

  • No tracked source for this period
  • Incomplete source coverage
No tracked source

No tracked source covers January 2022 to December 2022.

Source: md-mde-overflows. Records cover January 4, 2023 to November 3, 2026.

Show table

Reported volume per year

Gallons (axis: K thousand, M million), summed from the 29 reports that gave a volume as a number (1 did not).

  • Incomplete source coverage
Limited records

1 of 30 discharge reports gave no volume as a number; only numbers are summed.

Source: md-mde-overflows. Records cover January 4, 2023 to November 3, 2026.

Show table

Hours with a discharge or advisory status per year

Hours with a discharge or advisory status each year under DirtyWaterWatch rules; 2026 to date.

  • Discharge or advisory reported
  • Incomplete source coverage
Limited records

Official beach and cyanobacteria (harmful blue-green algae) advisories are counted on water pages only.

Source: md-mde-overflows. Records cover January 4, 2023 to November 3, 2026.

Show table

Share of the May to October season with a discharge or advisory status

Share of the hours from May 1 to October 31 with a discharge or advisory status under DirtyWaterWatch rules.

  • Discharge or advisory reported

Official beach and cyanobacteria (harmful blue-green algae) advisories are counted on water pages only.

Source: md-mde-overflows. Records cover January 4, 2023 to November 3, 2026.

Show table

Reported discharges by calendar month, all years

Every counted discharge report, by the calendar month it began.

Months are summed over every year a tracked source covers; the table gives the number of years behind each month.

Source: md-mde-overflows. Records cover January 4, 2023 to November 3, 2026.

Show table

Reported discharges by wastewater outlet

Wastewater outlets with the most tracked discharge records: 10 of 20, all years. Counts depend on reporting coverage and do not measure legal compliance or harm.

Source: md-mde-overflows. Records cover January 4, 2023 to November 3, 2026.

Show table
How these charts are counted

We count each discharge once. Where a source publishes notices and confirmed reports, we use confirmed reports for an operator's month when available; otherwise we use notices. We combine revisions and exclude duplicate state reports copied by the U.S. Environmental Protection Agency (EPA). Monthly and yearly totals appear separately. Status hours follow this site's rules. Shaded gaps mean missing coverage, not zero discharges.

  • md-mde-overflows: records from January 4, 2023 to the latest update