New Jersey / Waters /
Manasquan Reservoir
Reservoir in New Jersey, near Howell Township and Oak Glen
Current status
A discharge is reported as ongoing, a post-discharge period applies, or an official advisory is listed. Open the report for its source, dates and advice. This status since . Why this status, and its source
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.
Bookmark this water page and check it before each trip · Report a missing notice or error
About this status
Why this status: Discharge or advisory reported: official advisory.
Why we use this rule: An official advisory is listed. We show it while the authority keeps it in place; an old or missing update does not mean the advisory was lifted.
Source: https://www.arcgis.com/home/item.html?id=49190166531d4e5a811c9a91e4a41677. How long each status lasts, and why
Source: NJDEP Harmful Algal Bloom Program (Division of Water Monitoring, Standards and Pesticide Control), record 90ac9d2f-ccf1-4465-b362-f5f296a28fa6, updated by the source Oct 30, 2026, 8:00 AM EDT, retrieved 2026-11-02 21:19 UTC · Read the original notice
Updated .
Reports behind this status
- Discharge or advisory reported Cyanobacteria advisory (harmful blue-green algae) · operator not stated · outlet not stated · Oct 13, 2026, 10:25 AM EDT to still listed as in effect · volume not reported · Official advisory in effect, current rule period ends Nov 13, 2026, 7:00 AM EST
Source: NJDEP Harmful Algal Bloom Program (Division of Water Monitoring, Standards and Pesticide Control), record 90ac9d2f-ccf1-4465-b362-f5f296a28fa6, updated by the source Oct 30, 2026, 8:00 AM EDT, retrieved 2026-11-02 21:19 UTC · Read the original notice
Advice in the reports
NJDEP Harmful Algal Bloom Program (Division of Water Monitoring, Standards and Pesticide Control) · Oct 13, 2026 · Current status: sets this water's status now
“NJDEP HAB alert tier at this site: Danger.”
The last 90 days
- Discharge or advisory reported: to the latest update 6 reports: NJDEP Harmful Algal Bloom Program (Division of Water Monitoring, Standards and Pesticide Control) 6
Show records
The records are also in the report table on this page.
- Cyanobacteria advisory (harmful blue-green algae), started Oct 13, 2026, 10:25 AM EDT
- Cyanobacteria advisory (harmful blue-green algae), started Oct 13, 2026, 9:53 AM EDT
- Cyanobacteria advisory (harmful blue-green algae), started Oct 13, 2026, 9:43 AM EDT
- Cyanobacteria advisory (harmful blue-green algae), started Sep 29, 2026, 11:26 AM EDT
- Cyanobacteria advisory (harmful blue-green algae), started Aug 24, 2026, 9:26 AM EDT
- Cyanobacteria advisory (harmful blue-green algae), started Oct 7, 2025, 12:12 PM EDT
Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-02 21:26 UTC.
Reported discharges over time
- Hours with a discharge or advisory status on the Manasquan Reservoir in New Jersey, last 12 months1,277Reported on the Manasquan Reservoir in New Jersey: 0 · 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 Manasquan Reservoir in New Jersey28%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 Manasquan Reservoir in New Jersey6Reported on the Manasquan Reservoir in New Jersey: 6 · 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.
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 March 2025. 1 discharge reported to last more than 31 days is counted as 31 days.
Source: nj-hab. Records cover April 2, 2025 to November 2, 2026.
Show table
| Month | Hours with a discharge or advisory status | Hours from post-discharge periods | Hours from official advisories only | Hours in the month | Coverage |
|---|---|---|---|---|---|
| January 2022 | 0 | 0 | 0 | 744 | No tracked source for this period |
| February 2022 | 0 | 0 | 0 | 672 | No tracked source for this period |
| March 2022 | 0 | 0 | 0 | 744 | No tracked source for this period |
| April 2022 | 0 | 0 | 0 | 720 | No tracked source for this period |
| May 2022 | 0 | 0 | 0 | 744 | No tracked source for this period |
| June 2022 | 0 | 0 | 0 | 720 | No tracked source for this period |
| July 2022 | 0 | 0 | 0 | 744 | No tracked source for this period |
| August 2022 | 0 | 0 | 0 | 744 | No tracked source for this period |
| September 2022 | 0 | 0 | 0 | 720 | No tracked source for this period |
| October 2022 | 0 | 0 | 0 | 744 | No tracked source for this period |
| November 2022 | 0 | 0 | 0 | 720 | No tracked source for this period |
| December 2022 | 0 | 0 | 0 | 744 | No tracked source for this period |
| January 2023 | 0 | 0 | 0 | 744 | No tracked source for this period |
| February 2023 | 0 | 0 | 0 | 672 | No tracked source for this period |
| March 2023 | 0 | 0 | 0 | 744 | No tracked source for this period |
| April 2023 | 0 | 0 | 0 | 720 | No tracked source for this period |
| May 2023 | 0 | 0 | 0 | 744 | No tracked source for this period |
| June 2023 | 0 | 0 | 0 | 720 | No tracked source for this period |
| July 2023 | 0 | 0 | 0 | 744 | No tracked source for this period |
| August 2023 | 0 | 0 | 0 | 744 | No tracked source for this period |
| September 2023 | 0 | 0 | 0 | 720 | No tracked source for this period |
| October 2023 | 0 | 0 | 0 | 744 | No tracked source for this period |
| November 2023 | 0 | 0 | 0 | 720 | No tracked source for this period |
| December 2023 | 0 | 0 | 0 | 744 | No tracked source for this period |
| January 2024 | 0 | 0 | 0 | 744 | No tracked source for this period |
| February 2024 | 0 | 0 | 0 | 696 | No tracked source for this period |
| March 2024 | 0 | 0 | 0 | 744 | No tracked source for this period |
| April 2024 | 0 | 0 | 0 | 720 | No tracked source for this period |
| May 2024 | 0 | 0 | 0 | 744 | No tracked source for this period |
| June 2024 | 0 | 0 | 0 | 720 | No tracked source for this period |
| July 2024 | 0 | 0 | 0 | 744 | No tracked source for this period |
| August 2024 | 0 | 0 | 0 | 744 | No tracked source for this period |
| September 2024 | 0 | 0 | 0 | 720 | No tracked source for this period |
| October 2024 | 0 | 0 | 0 | 744 | No tracked source for this period |
| November 2024 | 0 | 0 | 0 | 720 | No tracked source for this period |
| December 2024 | 0 | 0 | 0 | 744 | No tracked source for this period |
| January 2025 | 0 | 0 | 0 | 744 | No tracked source for this period |
| February 2025 | 0 | 0 | 0 | 672 | No tracked source for this period |
| March 2025 | 0 | 0 | 0 | 744 | No tracked source for this period |
| April 2025 | 0 | 0 | 0 | 720 | Incomplete source coverage |
| May 2025 | 0 | 0 | 0 | 744 | |
| June 2025 | 0 | 0 | 0 | 720 | |
| July 2025 | 0 | 0 | 0 | 744 | |
| August 2025 | 0 | 0 | 0 | 744 | |
| September 2025 | 0 | 0 | 0 | 720 | |
| October 2025 | 588 | 0 | 588 | 744 | |
| November 2025 | 156 | 0 | 156 | 720 | |
| December 2025 | 0 | 0 | 0 | 744 | |
| January 2026 | 0 | 0 | 0 | 744 | |
| February 2026 | 0 | 0 | 0 | 672 | |
| March 2026 | 0 | 0 | 0 | 744 | |
| April 2026 | 0 | 0 | 0 | 720 | |
| May 2026 | 0 | 0 | 0 | 744 | |
| June 2026 | 0 | 0 | 0 | 720 | |
| July 2026 | 0 | 0 | 0 | 744 | |
| August 2026 | 183 | 0 | 183 | 744 | |
| September 2026 | 309 | 0 | 309 | 720 | |
| October 2026 | 744 | 0 | 744 | 744 | |
| November 2026 | 42 | 0 | 42 | 42 |
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
1 discharge reported to last more than 31 days is counted as 31 days.
Source: nj-hab. Records cover April 2, 2025 to November 2, 2026.
Show table
| Year | Hours with a discharge or advisory status | Share of the year | Coverage |
|---|---|---|---|
| 2025 | 744 | 8.5% | Incomplete source coverage |
| 2026 | 1,277 | 17.4% |
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.
- nj-hab: records from April 2, 2025 to the latest update
Reports linked to Manasquan Reservoir
| Start | End | Sewer operator | Outlet | Type | Volume | Source | Links |
|---|---|---|---|---|---|---|---|
| Oct 13, 2026, 10:25 AM EDT | still listed as in effect | not stated | Not provided | Cyanobacteria advisory (harmful blue-green algae) | volume not reported | NJDEP Harmful Algal Bloom Program (Division of Water Monitoring, Standards and Pesticide Control), record 90ac9d2f-ccf1-4465-b362-f5f296a28fa6, updated by the source Oct 30, 2026, 8:00 AM EDT, retrieved 2026-11-02 21:19 UTC · Read the original notice | Read report: Cyanobacteria advisory (harmful blue-green algae), , Oct 13, 2026, 10:25 AM EDT · Map |
| Oct 13, 2026, 9:53 AM EDT | Oct 30, 2026, 8:00 AM EDT | not stated | Not provided | Cyanobacteria advisory (harmful blue-green algae) | volume not reported | NJDEP Harmful Algal Bloom Program (Division of Water Monitoring, Standards and Pesticide Control), record 40aee7a8-9e00-47db-ab5e-6bff97edb8d1, updated by the source Oct 15, 2026, 8:00 AM EDT, retrieved 2026-11-02 21:19 UTC · Read the original notice | Read report: Cyanobacteria advisory (harmful blue-green algae), , Oct 13, 2026, 9:53 AM EDT · Map |
| Oct 13, 2026, 9:43 AM EDT | Oct 30, 2026, 8:00 AM EDT | not stated | Not provided | Cyanobacteria advisory (harmful blue-green algae) | volume not reported | NJDEP Harmful Algal Bloom Program (Division of Water Monitoring, Standards and Pesticide Control), record 46fa840e-0991-4edd-9e0f-95c3a43670be, updated by the source Oct 15, 2026, 8:00 AM EDT, retrieved 2026-11-02 21:19 UTC · Read the original notice | Read report: Cyanobacteria advisory (harmful blue-green algae), , Oct 13, 2026, 9:43 AM EDT · Map |
| Sep 29, 2026, 11:26 AM EDT | still listed as in effect | not stated | Not provided | Cyanobacteria advisory (harmful blue-green algae) | volume not reported | NJDEP Harmful Algal Bloom Program (Division of Water Monitoring, Standards and Pesticide Control), record ca348eb0-8272-4a1f-9eea-88fc6247d4bd, updated by the source Oct 9, 2026, 8:00 AM EDT, retrieved 2026-11-02 21:19 UTC · Read the original notice | Read report: Cyanobacteria advisory (harmful blue-green algae), , Sep 29, 2026, 11:26 AM EDT · Map |
| Aug 24, 2026, 9:26 AM EDT | still listed as in effect | not stated | Not provided | Cyanobacteria advisory (harmful blue-green algae) | volume not reported | NJDEP Harmful Algal Bloom Program (Division of Water Monitoring, Standards and Pesticide Control), record 5f9f15c8-1711-4e46-9e11-21d42c774e36, updated by the source Aug 29, 2026, 8:00 AM EDT, retrieved 2026-11-02 21:19 UTC · Read the original notice | Read report: Cyanobacteria advisory (harmful blue-green algae), , Aug 24, 2026, 9:26 AM EDT · Map |
| Oct 7, 2025, 12:12 PM EDT | Oct 9, 2026, 8:00 AM EDT | not stated | Not provided | Cyanobacteria advisory (harmful blue-green algae) | volume not reported | NJDEP Harmful Algal Bloom Program (Division of Water Monitoring, Standards and Pesticide Control), record b93d2e98-a21e-4b9a-9857-9e416ad00e75, updated by the source Oct 14, 2025, 12:00 PM EDT, retrieved 2026-11-02 21:19 UTC · Read the original notice | Open record below · Map |
Read the full record | |||||||
All reports in New Jersey by year: 2026 (5 here) · 2025 (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). · Manasquan Reservoir on OpenBoatLaunch
Nearby waters
- Manasquan River, NJ No current status shown about 3 km away
- Shark River, NJ No current status shown about 15 km away
- Lake Horicon, NJ No current status shown about 21 km away
- Assunpink Lake, NJ No current status shown about 26 km away
- Keyport Harbor, NJ No current status shown about 29 km away
Sources covering this water
- Division of Water Monitoring, Standards and Pesticide Control · Latest check succeeded · Last successful check: 2026-11-02 21:19 UTC
6 records linked to this water. Updated .