DirtyWaterWatch Public waters. Public record.

Maryland / Sewer operators /

Calvert County Department of Public Works

Sewer utility · Maryland · Solomons, Prince Frederick

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)
not recorded
Wastewater outlets
None with locations in our records
Waters listed as receiving wastewater
Mill Creek
Tracked waters
Mill Creek, MD, Port Tobacco River, MD, Patuxent River, MD
Discharge records counted
13 records · latest
Total reported volume in these records
567,150 gallons across the 11 records that give a volume (2 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 Calvert County Department of Public Works or the state publishes its notices (check them for an alert sign-up):

Source: Calvert County Department of Public Works'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.

Reports linked to Calvert County Department of Public Works, newest first
WhenReportStatus
to Sep 29, 4:00 PMMill Creek · 204 North Prince Frederick Boulevard · SSO · 500,000 gallons report · notice · mapended
to 10:30 AM“N/A” · 295 West Avenue · SSO · 50 gallons report · noticeended
to 6:00 AM“n/a (the SSO was contained within the facility ground)” · 500 Sweetwater Rd. · SSO · 2,000 gallons report · noticeended
to 1:05 PM“N/A” · 11352 H G Trueman Rd · SSO · 500 gallons report · notice · mapended
to 12:01 PM“Groundwater for the portion that made it off of the concrete pad. The portion that was contained to the concrete drained into a sewage receiving tank at the WWTP.” · 500 Sweetwater Rd · SSO · 200 gallons report · notice · mapended
to Feb 23, 3:00 AM“None.” · 333 Chesapeake Ave · SSO · 100 gallons report · noticeended
to 6:50 AMPort Tobacco River · 9225 Twin Berry Drive · SSO · 5,000 gallons report · notice · mapended
to 3:00 PM“None.” · 1325 Fairwood Drive · SSO · 1,200 gallons report · notice · mapended
to 1:45 PMPatuxent River · 14261 Solomons Island Road · SSO · 7,800 gallons report · notice · mapended
to 1:50 PM“There was no discharge to waters of the State” · 4590 Hallowing Point Road · SSO · 300 gallons report · noticeended
to 12:01 AM“Not thought to have reached waterway (Sewell Branch to Huntington Creek is closest)” · 1365 Fairwood Drive · SSO · volume not reported report · noticeended
to Dec 4 ’24, 1:00 PM“just a little spillage out of the manhole not enough to reach waters of the state.” · 3955 Gordon Stinnett · SSO · volume not reported report · noticeended
to 9:00 AM“None received SSO” · 500 Sweetwater Road · SSO · 50,000 gallons report · noticeended

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

All reports in Maryland by year: 2026 (6 from Calvert County Department of Public Works) · 2025 (5 from Calvert County Department of Public Works) · 2024 (2 from Calvert County Department of Public Works)

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.
  • Caution: to
    1 report: Mill Creek 1
    Show records

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

  • Discharge or advisory reported: to
    1 report: Mill Creek 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 08:50 UTC.

Reported discharges over time

  • Discharges reported by Calvert County Department of Public Works, last 12 months7December 2025 to November 2026Verified reports where available, else notices; revisions and duplicates counted once.
  • Days with a discharge reported by Calvert County Department of Public Works, last 12 months12December 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 Calvert County Department of Public Works's reports, last 12 months115December 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 (Calvert County Department of Public Works)2.4%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

13 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 11 reports that gave a volume as a number (2 did not).

  • Incomplete source coverage
Limited records

2 of 13 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 13, 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