New Jersey / Reports /

Cyanobacteria advisory (harmful blue-green algae) reported, Sep 29, 2026

Advisory active · NJDEP Harmful Algal Bloom Program (Division of Water Monitoring, Standards and Pesticide Control)

Source: 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

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1. Reported wastewater outlet

Operator named in the record: not named. Outlet: not stated. Location: 40.17768, -74.21769; location source: given in the source record.

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

2. Waters named in the notice

The notice names: “Manasquan Reservoir”. DirtyWaterWatch links this report to Manasquan Reservoir, NJ. Match basis: the water named in the report.

3. Estimated downstream stretch

We estimate routes only on rivers before they become tidal. We do not estimate routes through tidal water or lakes.

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When it happened and when it was reported

Event and notice times use Eastern Time (EST or EDT). Retrieval times use Coordinated Universal Time (UTC).

Started

Sep 29, 2026, 11:26 AM EDT

Ended

not reported

Detail provided by the source

Times known to the minute

Reported to the source

not given

Published

not given

Source last updated

Oct 9, 2026, 8:00 AM EDT

Last retrieved by DirtyWaterWatch

2026-11-02 21:19 UTC

What and how much

Type

Cyanobacteria (harmful blue-green algae) can make water unfit for contact; the issuing authority decides when its advisory ends.

Status in the record

Advisory active

Material

not stated

Volume

volume not reported (not stated whether estimated or measured)

Volume as reported

none

Advice from NJDEP Harmful Algal Bloom Program (Division of Water Monitoring, Standards and Pesticide Control)

“NJDEP HAB alert tier at this site: Advisory.”

Advice period

This report does not state a period. See the rule DirtyWaterWatch applies and its source.

Basis

NJDEP HAB Dashboard: the current alert at a site is its latest sample's tier (HAB Watch, Advisory, Warning, Danger); no fixed window

Status history from this report

• Discharge or advisory reported Manasquan Reservoir: Official advisory in effect, Sep 29, 2026, 11:26 AM EDT to Oct 23, 2026, 8:00 AM EDT
• No current status shown Manasquan Reservoir: Advisory not re-confirmed by its source recently, Oct 23, 2026, 8:00 AM EDT to Dec 28, 2026, 10:26 AM EST

Source: DirtyWaterWatch calculations using this report and the published status rules. Updated 2026-11-02 21:26 UTC.

Source and versions

Source

Division of Water Monitoring, Standards and Pesticide Control

Source record number

ca348eb0-8272-4a1f-9eea-88fc6247d4bd

Original notice

Read the original notice

Earlier version

None: this is the first record

Later versions

None

{
  "waterbody": "Manasquan Reservoir",
  "site_id": "Environmental Center Dock",
  "municipality": "Howell Township",
  "county": "Monmouth",
  "bathing_beach": "NA",
  "visits": [
    {
      "objectid": 2893,
      "sitevisitdate": "2026-09-29T11:26:00-04:00",
      "siteid": "Environmental Center Dock",
      "advisorytier": "Advisory",
      "advistorytrigdt": "2026-10-09T08:00:00-04:00",
      "algaeobserved": "Yes",
      "cellct": 164125,
      "microcystins": null,
      "cylindrospermopsin": null,
      "anatoxin": null,
      "saxitoxin": null,
      "predomtaxa": "Coelosphaerium/Woronichinia",
      "toxinpresent": null,
      "comments": "Njwsa ysi 1.2 pc rfu 8.0 pe rfu",
      "EditDate": "2026-10-23T11:09:06-04:00"
    }
  ],
  "credit": "NJDEP HAB Dashboard (provided for information purposes only; not monitored 24/7)",
  "current_tier": "Advisory",
  "highest_tier": "Advisory",
  "last_confirmed_basis": "advistorytrigdt (the date the tier was set)"
}