Reports /

Cyanobacteria advisory (harmful blue-green algae) reported, Jun 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 3d51e10f-8ea1-4f64-892e-8e996216f930, updated by the source Jul 4, 2026, 12:00 PM EDT, retrieved 2026-11-02 21:19 UTC · Read the original notice

Read the original notice · Report an error

1. Reported wastewater outlet

Operator named in the record: not named. Outlet: not stated. Location: 40.38954, -74.38010; 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: “Duhernal Lower Pond”. Not linked to a mapped water.

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

Jun 29, 2026, 9:00 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

Jul 4, 2026, 12:00 PM 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: Watch.”

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

Source and versions

Source

Division of Water Monitoring, Standards and Pesticide Control

Source record number

3d51e10f-8ea1-4f64-892e-8e996216f930

Original notice

Read the original notice

Earlier version

None: this is the first record

Later versions

None

{
  "waterbody": "Duhernal Lower Pond",
  "site_id": "W Greystone R",
  "municipality": "Old Bridge Township",
  "county": "Middlesex",
  "bathing_beach": "NA",
  "visits": [
    {
      "objectid": 2490,
      "sitevisitdate": "2026-06-29T09:00:00-04:00",
      "siteid": "W Greystone R",
      "advisorytier": "Watch",
      "advistorytrigdt": "2026-07-04T12:00:00-04:00",
      "algaeobserved": "Yes",
      "cellct": 35125,
      "microcystins": 0.096,
      "cylindrospermopsin": null,
      "anatoxin": null,
      "saxitoxin": null,
      "predomtaxa": "Merismopedia",
      "toxinpresent": null,
      "comments": null,
      "EditDate": "2026-08-27T08:43:51-04:00"
    }
  ],
  "credit": "NJDEP HAB Dashboard (provided for information purposes only; not monitored 24/7)",
  "current_tier": "Watch",
  "highest_tier": "Watch",
  "last_confirmed_basis": "advistorytrigdt (the date the tier was set)"
}