Seneca Lake

Lake in New York, near Dresden, Geneva, Hector, Lodi Station, Starkey and Watkins Glen

No current status shownSource update overdue

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

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. Larger round markers with a label mark beach and other official advisories nearby.

Bookmark this water page and check it before each trip · Report a missing notice or error

About this status

Why this status: No current status: no report we track sets a status on this water outline now.

How long each status lasts, and why

Sources checked: NYHABS (last successful check 2026-11-02 20:38 UTC); State Park beaches (last successful check 2026-11-02 21:20 UTC). Status by DirtyWaterWatch, updated 2026-11-02 21:26 UTC.

No status does not mean the water is safe. Follow posted signs and local health advice.

Source update overdue since Nov 2, 2026, 3:38 PM EST: we have not received the expected update from NYHABS. Recent reports may be missing.

Updated Nov 2, 2026, 4:26 PM EST.

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.

No discharge, advisory or caution periods are shown for this water in this time span. Check downstream stretches and source coverage.

Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-02 21:26 UTC.

A source update was overdue from Nov 2, 2026, 3:00 PM EST to the latest update.

Reported discharges over time

Historical charts are not available here. See the reports and sources on this page.

Reports linked to Seneca Lake

Reports linked to Seneca Lake, newest first
Start	End	Sewer operator	Outlet	Type	Volume	Source	Links
Oct 21, 2026, 4:00 PM EDT	still listed as in effect	not stated	Not provided	Cyanobacteria advisory (harmful blue-green algae)	volume not reported	NYS DEC Harmful Algal Blooms Program (NYHABS), record 18304e62-008c-4475-88a6-b3e58ee052d4, updated by the source Oct 23, 2026, 8:00 AM EDT, retrieved 2026-11-02 20:38 UTC · Read the original notice	Read report: Cyanobacteria advisory (harmful blue-green algae), , Oct 21, 2026, 4:00 PM EDT · Map
Sep 1, 2025	Sep 2, 2025	not stated	Sampson SP	Cyanobacteria advisory (harmful blue-green algae)	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record sampson-sp:seneca-lake:2025-09-01, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
Read the full record See it in the archive for its year
Jul 28, 2025	Aug 1, 2025	not stated	Sampson SP	Cyanobacteria advisory (harmful blue-green algae)	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record sampson-sp:seneca-lake:2025-07-28, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Jul 21, 2025	Jul 25, 2025	not stated	Sampson SP	Cyanobacteria advisory (harmful blue-green algae)	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record sampson-sp:seneca-lake:2025-07-21, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Aug 26, 2024	Aug 28, 2024	not stated	Sampson SP	Cyanobacteria advisory (harmful blue-green algae)	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record sampson-sp:seneca-lake:2024-08-26, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Aug 1, 2024	Aug 5, 2024	not stated	Sampson SP	Cyanobacteria advisory (harmful blue-green algae)	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record sampson-sp:seneca-lake:2024-08-01, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Jun 24, 2024	Jun 25, 2024	not stated	Sampson SP	Beach advisory	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record sampson-sp:seneca-lake:2024-06-24, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Jul 31, 2023	Aug 2, 2023	not stated	Sampson SP	Cyanobacteria advisory (harmful blue-green algae)	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record sampson-sp:seneca-lake:2023-07-31, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Aug 16, 2022	Aug 22, 2022	not stated	Sampson SP	Cyanobacteria advisory (harmful blue-green algae)	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record sampson-sp:seneca-lake:2022-08-16, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Aug 19, 2019	Aug 23, 2019	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2019-08-19, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Aug 12, 2019	Aug 13, 2019	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2019-08-12, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Aug 5, 2019	Aug 6, 2019	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2019-08-05, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Jun 24, 2019	Jun 28, 2019	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2019-06-24, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Aug 22, 2018	Aug 27, 2018	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2018-08-22, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Aug 13, 2018	Aug 21, 2018	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2018-08-13, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Aug 6, 2018	Aug 9, 2018	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2018-08-06, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Aug 6, 2017	Aug 7, 2017	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2017-08-06, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Jul 31, 2017	Aug 2, 2017	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2017-07-31, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Jul 24, 2017	Jul 27, 2017	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2017-07-24, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Jul 10, 2017	Jul 12, 2017	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2017-07-10, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Aug 29, 2016	Aug 31, 2016	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2016-08-29, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Aug 15, 2016	Aug 22, 2016	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2016-08-15, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Aug 1, 2016	Aug 2, 2016	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2016-08-01, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Jul 18, 2016	Jul 19, 2016	not stated	Seneca Lake SP	Beach closure	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record seneca-lake-sp:seneca-lake:2016-07-18, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Jul 16, 2016	Jul 19, 2016	not stated	Sampson SP	Cyanobacteria advisory (harmful blue-green algae)	volume not reported	NYS Office of Parks, Recreation and Historic Preservation (State Park beaches), record sampson-sp:seneca-lake:2016-07-16, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Read the original notice	Open record below · Map
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Showing the latest 25 records of 30 records. See them all with filters.

All reports in New York by year: 2026 (1 here) · 2025 (3 here) · 2024 (3 here) · 2023 (1 here) · 2022 (1 here) · 2019 (4 here) · 2018 (3 here) · 2017 (4 here) · 2016 (7 here) · 2015 (3 here)

Beaches named in these records: Sampson SP, Seneca Lake SP.

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

Clute Park Boat Launch, Watkins Glen · Boat ramp
Lakefront Park Boat Launch, Geneva · Boat ramp
Lodi Point State Park Boat Launch, Lodi Station · Boat ramp
Sampson State Park Boat Launch, Dresden · Boat ramp
Seneca Lake Boat Launch near Watkins Glen · Boat ramp
Seneca Lake State Park Boat Launch, Geneva · Boat ramp
Severne Point Boat Launch, Starkey · Boat ramp
Smith Memorial Park Boat Launch, Hector · Boat ramp

Source: OpenBoatLaunch launch records (public agency data and OpenStreetMap, Open Database License). · Seneca Lake on OpenBoatLaunch

Nearby waters

Keuka Lake, NY No current status shown about 21 km away
Cayuga Lake, NY No current status shownSource update overdue about 24 km away
Canandaigua Lake, NY Discharge or advisory reportedSource update overdue about 36 km away
Canandaigua Outlet, NY No current status shown about 41 km away
Honeoye Lake, NY No current status shown about 50 km away

Sources covering this water

NYHABS · Update overdue · Last successful check: 2026-11-02 20:38 UTC Source update overdue
State Park beaches · Latest check succeeded · Last successful check: 2026-11-02 21:20 UTC

30 records linked to this water. Updated Nov 2, 2026, 4:26 PM EST.