Little Patuxent River
River in Maryland, past Columbia, Crofton, Ellicott City, Fort Meade, Maryland City, North Laurel, Odenton and Savage
Current status
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.
Check Howard County Department of Public Works (Little Patuxent WRP and collection system)'s notices · Bookmark this water page and check it before each trip · Report a missing notice or error
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 09:35 UTC). Status by DirtyWaterWatch, updated 2026-11-03 09:44 UTC. · Updated
Estimated downstream stretches on Little Patuxent River
No downstream stretch has a current status here as of Nov 3, 2026, 4:44 AM EST. Check the reports below.
The last 90 days
- Caution: to 1 report: Howard County DPW 1
Show records
The records are also in the report table on this page.
- Discharge or advisory reported: to 1 report: Howard County DPW 1
Show records
The records are also in the report table on this page.
- Caution: to 2 reports: Anne Arundel County DPW 2
Show records
The records are also in the report table on this page.
- Discharge or advisory reported: to 1 report: Anne Arundel County DPW 1
Show records
The records are also in the report table on this page.
- Caution: to 1 report: Anne Arundel County DPW 1
Show records
The records are also in the report table on this page.
- Discharge or advisory reported: to 1 report: Anne Arundel County DPW 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 09:44 UTC.
Reported discharges over time
- Discharges affecting the Little Patuxent River in Maryland, last 12 months77 affecting this stretch: 7 reported in Maryland, none arriving from upstreamDecember 2025 to November 2026Verified reports where available, else notices; revisions and duplicates counted once. Arriving discharges are estimated from modeled downstream reaches.
- Days with a discharge affecting the Little Patuxent River in Maryland, last 12 months7Reported on the Little Patuxent River in Maryland: 7 · Arriving from outfalls upstream, estimated: 0December 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 on the Little Patuxent River in Maryland, last 12 months9Reported on the Little Patuxent River in Maryland: 9 · Arriving from outfalls upstream, estimated: 0December 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 on the Little Patuxent River in Maryland0.1%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.
- Records behind the last-90-days strip for the Little Patuxent River in Maryland3Reported on the Little Patuxent River in Maryland: 3 · Arriving from outfalls upstream, estimated: 0last 90 daysEvery distinct record the strip lists for its red, yellow and unresolved hours, notices and unresolved reports included; counted as the strip counts them.
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 covers January 2022 to December 2022.
Source: md-mde-overflows. Records cover January 4, 2023 to November 3, 2026.
Show table
| Month | Combined sewer overflow | Sanitary sewer overflow | Treatment bypass, blended or other | Total | Counted from | Coverage |
|---|---|---|---|---|---|---|
| January 2022 | 0 | 0 | 0 | 0 | No tracked source for this period | |
| February 2022 | 0 | 0 | 0 | 0 | No tracked source for this period | |
| March 2022 | 0 | 0 | 0 | 0 | No tracked source for this period | |
| April 2022 | 0 | 0 | 0 | 0 | No tracked source for this period | |
| May 2022 | 0 | 0 | 0 | 0 | No tracked source for this period | |
| June 2022 | 0 | 0 | 0 | 0 | No tracked source for this period | |
| July 2022 | 0 | 0 | 0 | 0 | No tracked source for this period | |
| August 2022 | 0 | 0 | 0 | 0 | No tracked source for this period | |
| September 2022 | 0 | 0 | 0 | 0 | No tracked source for this period | |
| October 2022 | 0 | 0 | 0 | 0 | No tracked source for this period | |
| November 2022 | 0 | 0 | 0 | 0 | No tracked source for this period | |
| December 2022 | 0 | 0 | 0 | 0 | No tracked source for this period | |
| January 2023 | 0 | 0 | 0 | 0 | Incomplete source coverage | |
| February 2023 | 0 | 0 | 0 | 0 | ||
| March 2023 | 0 | 0 | 0 | 0 | ||
| April 2023 | 0 | 1 | 0 | 1 | Source records | |
| May 2023 | 0 | 0 | 0 | 0 | ||
| June 2023 | 0 | 0 | 0 | 0 | ||
| July 2023 | 0 | 0 | 0 | 0 | ||
| August 2023 | 0 | 1 | 0 | 1 | Source records | |
| September 2023 | 0 | 0 | 0 | 0 | ||
| October 2023 | 0 | 0 | 0 | 0 | ||
| November 2023 | 0 | 1 | 0 | 1 | Source records | |
| December 2023 | 0 | 0 | 0 | 0 | ||
| January 2024 | 0 | 2 | 1 | 3 | Source records | |
| February 2024 | 0 | 2 | 0 | 2 | Source records | |
| March 2024 | 0 | 3 | 0 | 3 | Source records | |
| April 2024 | 0 | 0 | 0 | 0 | ||
| May 2024 | 0 | 0 | 0 | 0 | ||
| June 2024 | 0 | 0 | 0 | 0 | ||
| July 2024 | 0 | 0 | 0 | 0 | ||
| August 2024 | 0 | 1 | 0 | 1 | Source records | |
| September 2024 | 0 | 0 | 0 | 0 | ||
| October 2024 | 0 | 1 | 0 | 1 | Source records | |
| November 2024 | 0 | 0 | 0 | 0 | ||
| December 2024 | 0 | 2 | 0 | 2 | Source records | |
| January 2025 | 0 | 0 | 0 | 0 | ||
| February 2025 | 0 | 0 | 0 | 0 | ||
| March 2025 | 0 | 0 | 0 | 0 | ||
| April 2025 | 0 | 0 | 0 | 0 | ||
| May 2025 | 0 | 1 | 0 | 1 | Source records | |
| June 2025 | 0 | 1 | 0 | 1 | Source records | |
| July 2025 | 0 | 0 | 0 | 0 | ||
| August 2025 | 0 | 1 | 1 | 2 | Source records | |
| September 2025 | 0 | 1 | 0 | 1 | Source records | |
| October 2025 | 0 | 3 | 0 | 3 | Source records | |
| November 2025 | 0 | 0 | 0 | 0 | ||
| December 2025 | 0 | 2 | 0 | 2 | Source records | |
| January 2026 | 0 | 0 | 0 | 0 | ||
| February 2026 | 0 | 1 | 0 | 1 | Source records | |
| March 2026 | 0 | 0 | 0 | 0 | ||
| April 2026 | 0 | 0 | 0 | 0 | ||
| May 2026 | 0 | 0 | 0 | 0 | ||
| June 2026 | 0 | 0 | 0 | 0 | ||
| July 2026 | 0 | 1 | 0 | 1 | Source records | |
| August 2026 | 0 | 0 | 0 | 0 | ||
| September 2026 | 0 | 2 | 0 | 2 | Source records | |
| October 2026 | 0 | 1 | 0 | 1 | Source records | |
| November 2026 | 0 | 0 | 0 | 0 |
Hours with a discharge or advisory status per month
Hours when this water had a discharge or advisory status under DirtyWaterWatch rules.
- Discharge or advisory reported
- No tracked source for this period
- Incomplete source coverage
No tracked source covers January 2022 to December 2022.
Source: md-mde-overflows. Records cover January 4, 2023 to November 3, 2026.
Show table
| Month | Hours with a discharge or advisory status | Hours from post-discharge periods | Hours in the month | Coverage |
|---|---|---|---|---|
| January 2022 | 0 | 0 | 744 | No tracked source for this period |
| February 2022 | 0 | 0 | 672 | No tracked source for this period |
| March 2022 | 0 | 0 | 744 | No tracked source for this period |
| April 2022 | 0 | 0 | 720 | No tracked source for this period |
| May 2022 | 0 | 0 | 744 | No tracked source for this period |
| June 2022 | 0 | 0 | 720 | No tracked source for this period |
| July 2022 | 0 | 0 | 744 | No tracked source for this period |
| August 2022 | 0 | 0 | 744 | No tracked source for this period |
| September 2022 | 0 | 0 | 720 | No tracked source for this period |
| October 2022 | 0 | 0 | 744 | No tracked source for this period |
| November 2022 | 0 | 0 | 720 | No tracked source for this period |
| December 2022 | 0 | 0 | 744 | No tracked source for this period |
| January 2023 | 0 | 0 | 744 | Incomplete source coverage |
| February 2023 | 0 | 0 | 672 | |
| March 2023 | 0 | 0 | 744 | |
| April 2023 | 1 | 1 | 720 | |
| May 2023 | 0 | 0 | 744 | |
| June 2023 | 0 | 0 | 720 | |
| July 2023 | 0 | 0 | 744 | |
| August 2023 | 2 | 2 | 744 | |
| September 2023 | 0 | 0 | 720 | |
| October 2023 | 0 | 0 | 744 | |
| November 2023 | 0 | 0 | 720 | |
| December 2023 | 0 | 0 | 744 | |
| January 2024 | 24 | 24 | 744 | |
| February 2024 | 36 | 36 | 696 | |
| March 2024 | 9 | 9 | 744 | |
| April 2024 | 0 | 0 | 720 | |
| May 2024 | 0 | 0 | 744 | |
| June 2024 | 0 | 0 | 720 | |
| July 2024 | 0 | 0 | 744 | |
| August 2024 | 1 | 1 | 744 | |
| September 2024 | 0 | 0 | 720 | |
| October 2024 | 21 | 21 | 744 | |
| November 2024 | 0 | 0 | 720 | |
| December 2024 | 1 | 1 | 744 | |
| January 2025 | 0 | 0 | 744 | |
| February 2025 | 0 | 0 | 672 | |
| March 2025 | 0 | 0 | 744 | |
| April 2025 | 0 | 0 | 720 | |
| May 2025 | 30 | 30 | 744 | |
| June 2025 | 2 | 2 | 720 | |
| July 2025 | 0 | 0 | 744 | |
| August 2025 | 26 | 26 | 744 | |
| September 2025 | 0 | 0 | 720 | |
| October 2025 | 3 | 3 | 744 | |
| November 2025 | 0 | 0 | 720 | |
| December 2025 | 3 | 3 | 744 | |
| January 2026 | 0 | 0 | 744 | |
| February 2026 | 1 | 1 | 672 | |
| March 2026 | 0 | 0 | 744 | |
| April 2026 | 0 | 0 | 720 | |
| May 2026 | 0 | 0 | 744 | |
| June 2026 | 0 | 0 | 720 | |
| July 2026 | 0 | 0 | 744 | |
| August 2026 | 0 | 0 | 744 | |
| September 2026 | 3 | 3 | 720 | |
| October 2026 | 1 | 1 | 744 | |
| November 2026 | 0 | 0 | 54 |
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 covers January 2022 to December 2022.
Source: md-mde-overflows. Records cover January 4, 2023 to November 3, 2026.
Show table
| Month | Days with a reported discharge | Coverage |
|---|---|---|
| January 2022 | 0 | No tracked source for this period |
| February 2022 | 0 | No tracked source for this period |
| March 2022 | 0 | No tracked source for this period |
| April 2022 | 0 | No tracked source for this period |
| May 2022 | 0 | No tracked source for this period |
| June 2022 | 0 | No tracked source for this period |
| July 2022 | 0 | No tracked source for this period |
| August 2022 | 0 | No tracked source for this period |
| September 2022 | 0 | No tracked source for this period |
| October 2022 | 0 | No tracked source for this period |
| November 2022 | 0 | No tracked source for this period |
| December 2022 | 0 | No tracked source for this period |
| January 2023 | 0 | Incomplete source coverage |
| February 2023 | 0 | |
| March 2023 | 0 | |
| April 2023 | 1 | |
| May 2023 | 0 | |
| June 2023 | 0 | |
| July 2023 | 0 | |
| August 2023 | 1 | |
| September 2023 | 0 | |
| October 2023 | 0 | |
| November 2023 | 1 | |
| December 2023 | 0 | |
| January 2024 | 3 | |
| February 2024 | 3 | |
| March 2024 | 4 | |
| April 2024 | 0 | |
| May 2024 | 0 | |
| June 2024 | 0 | |
| July 2024 | 0 | |
| August 2024 | 1 | |
| September 2024 | 0 | |
| October 2024 | 2 | |
| November 2024 | 0 | |
| December 2024 | 1 | |
| January 2025 | 0 | |
| February 2025 | 0 | |
| March 2025 | 0 | |
| April 2025 | 0 | |
| May 2025 | 2 | |
| June 2025 | 1 | |
| July 2025 | 0 | |
| August 2025 | 3 | |
| September 2025 | 1 | |
| October 2025 | 2 | |
| November 2025 | 0 | |
| December 2025 | 2 | |
| January 2026 | 0 | |
| February 2026 | 1 | |
| March 2026 | 0 | |
| April 2026 | 0 | |
| May 2026 | 0 | |
| June 2026 | 0 | |
| July 2026 | 1 | |
| August 2026 | 0 | |
| September 2026 | 2 | |
| October 2026 | 1 | |
| November 2026 | 0 |
Reported volume per year
Gallons (axis: K thousand, M million), summed from the 30 reports that gave a volume as a number.
- Incomplete source coverage
Source: md-mde-overflows. Records cover January 4, 2023 to November 3, 2026.
Show table
| Year | Reported volume, gallons | Reports with a volume | Reports without a volume | Coverage |
|---|---|---|---|---|
| 2023 | 1,500 | 3 | 0 | Incomplete source coverage |
| 2024 | 1,489,680 | 12 | 0 | |
| 2025 | 2,322,100 | 10 | 0 | |
| 2026 | 37,150 | 5 | 0 |
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
Source: md-mde-overflows. Records cover January 4, 2023 to November 3, 2026.
Show table
| Year | Hours with a discharge or advisory status | Share of the year | Coverage |
|---|---|---|---|
| 2023 | 3 | 0.0% | Incomplete source coverage |
| 2024 | 92 | 1.1% | |
| 2025 | 64 | 0.7% | |
| 2026 | 6 | 0.1% |
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
| Month | Reported discharges | Years of records |
|---|---|---|
| January | 3 | 4 |
| February | 3 | 4 |
| March | 3 | 4 |
| April | 1 | 4 |
| May | 1 | 4 |
| June | 1 | 4 |
| July | 1 | 4 |
| August | 4 | 4 |
| September | 3 | 4 |
| October | 5 | 4 |
| November | 1 | 4 |
| December | 4 | 3 |
Reported discharges by wastewater outlet
Wastewater outlets with the most tracked discharge records: 10 of 19, 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
| Wastewater outlet | Sewer operator | Reported discharges |
|---|---|---|
| 8791 Piney Orchard Parkway | Anne Arundel County DPW | 6 |
| 1640 Professional Blvd | Anne Arundel County DPW | 5 |
| 8900 Greenwood | Howard County DPW | 2 |
| 8900 Greenwood Place | Howard County DPW | 2 |
| River Road | Howard County DPW | 1 |
| 11238 Pear Tree Way | Howard County DPW | 1 |
| 6310 Hillside Court | Howard County DPW | 1 |
| 1640 Patuxent Professional Blvd | Anne Arundel County DPW | 1 |
| 3220 Laurel Fort Meade Rd | American Water Operations & Maintenance, Inc. | 1 |
| 8409 Sweet Cherry Lane | Howard County DPW | 1 |
| Other outlets (9) | 9 |
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
Reports linked to Little Patuxent River
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.
| When | Report | Status |
|---|---|---|
| to 2:00 PM | Howard County DPW · River Road · SSO · 33,000 gallons report · notice · map | ended |
| to 9:00 AM | Anne Arundel County DPW · 8791 Piney Orchard Parkway · SSO · 150 gallons report · notice · map | ended |
| to 10:15 AM | Anne Arundel County DPW · 8791 Piney Orchard Parkway · SSO · 1,500 gallons report · notice · map | ended |
| to 11:30 PM | Anne Arundel County DPW · 8791 Piney Orchard Parkway · SSO · 1,500 gallons report · notice · map | ended |
| to 3:20 AM | Anne Arundel County DPW · 1640 Professional Blvd · SSO · 1,000 gallons report · notice · map | ended |
| to 4:00 PM | Howard County DPW · 11238 Pear Tree Way · SSO · 500 gallons report · notice · map | ended |
| to 7:10 PM | Howard County DPW · 6310 Hillside Court · SSO · 100 gallons report · notice · map | ended |
| to 10:40 AM | Anne Arundel County DPW · 1640 Professional Blvd · SSO · 2,000 gallons report · notice · map | ended |
| to 11:00 AM | Anne Arundel County DPW · 1640 Professional Blvd · SSO · 3,000 gallons report · notice · map | ended |
| to 1:20 PM | Anne Arundel County DPW · 1640 Patuxent Professional Blvd · SSO · 9,000 gallons report · notice · map | ended |
| to 6:45 PM | Anne Arundel County DPW · 8791 Piney orchard Parkway · SSO · 3,000 gallons report · notice · map | ended |
| to Aug 30 ’25, 10:30 PM | American Water (Fort Meade) · 3220 Laurel Fort Meade Rd · Bypass · 1.3 million gallons report · notice · map | ended |
| to 12:26 PM | Anne Arundel County DPW · 1640 Professional Blvd · SSO · 1,000 gallons report · notice · map | ended |
| to 6:30 PM | Howard County DPW · 8409 Sweet Cherry Lane · SSO · 3,500 gallons report · notice · map | ended |
| to May 8 ’25, 6:00 PM | Howard County DPW · 9045 Watchlight Court (behind) · SSO · 1 million gallons report · notice · map | ended |
| to 10:00 PM | Anne Arundel County DPW · 8791 Piney Orchard Parkway · SSO · 6,000 gallons in all map | ended |
| to 10:00 PM | Anne Arundel County DPW · 8791 Piney Orchard Parkway · SSO · 3,000 gallons report · notice · map | ended |
| to 10:00 PM | Anne Arundel County DPW · 8791 Piney Orchard Parkkway · SSO · 3,000 gallons report · notice · map | ended |
| to 12:45 PM | Howard County DPW · 11231 Powder Run · SSO (earlier version) · 250 gallons report · notice · map | ended |
| to Oct 8 ’24, 1:00 PM | Howard County DPW · 8900 Greenwood · SSO · 1,260 gallons report · notice · map | ended |
| to 7:45 PM | Howard County DPW · 8900 Greenwood Place · SSO · 110,000 gallons report · notice · map | ended |
| to Mar 25 ’24, 1:15 AM | Howard County DPW · 10261 Little Patuxent Pkwy · SSO (earlier version) · 10,000 gallons in all map | ended |
| to Mar 25 ’24, 1:15 AM | Howard County DPW · 10261 Little Patuxent Pkwy · SSO (earlier version) · 5,000 gallons report · notice · map | ended |
| to Mar 25 ’24, 1:15 AM | Howard County DPW · 10261 Little Patuxent Pkwy · SSO · 5,000 gallons report · notice · map | ended |
| to 1:15 PM | Anne Arundel County DPW · 8791 Piney Orchard Parkway · SSO · 2,000 gallons report · notice · map | ended |
| to 6:30 PM | Howard County DPW · 8880 Baltimore Street · SSO · 32 gallons report · notice · map | ended |
| to 9:15 AM | Howard County DPW · 8900 Greenwood Place · SSO · 100 gallons report · notice · map | ended |
Sources: MDE Reported Sewer Overflows (New for 2023), Maryland Open Data Portal (Socrata stgj-u72u), retrieved 2026-11-03 09:35 UTC. A report's record id and times show when you hover or focus its "report" link.
Showing the latest 25 records of 32 records.See them all with filters.
All reports in Maryland by year: 2026 (5 here) · 2025 (10 here) · 2024 (14 here) · 2023 (3 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.
Sewer operators listed for this water: Howard County Department of Public Works (Little Patuxent WRP and collection system), Anne Arundel County Department of Public Works (Bureau of Utility Operations), American Water (Fort Meade WWTP), City of Bowie.
Boat launches
No public boat launch is listed in our records for this water.
Nearby waters
- Dorsey Run, MD No current status shown about 2 km away
- Hammond Branch, MD No current status shown about 5 km away
- Rockburn Branch, MD No current status shown about 9 km away
- Stony Run, MD No current status shown about 10 km away
- Bill Branch, MD No current status shown about 13 km away
Sources covering this water
- MDE Reported Sewer Overflows (New for 2023), Maryland Open Data Portal (Socrata stgj-u72u) · Latest check succeeded · Last successful check: 2026-11-03 09:35 UTC
32 records linked to this water. Updated .