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California sewage discharges in 2023

90 records of sewage discharges and water advisories in California dated in 2023, newest first. Each record keeps the source's own times and wording; a record from the last three months, or one that sets a status now, also has a page of its own.

By type: Cyanobacteria advisory (harmful blue-green algae)90

By source: California State Water Resources Control Board (FHAB program)90

2023 in other states: Connecticut, District of Columbia, Florida, Illinois, Maine, Maryland, Massachusetts, Michigan, New Hampshire, New York, North Carolina, Pennsylvania, Rhode Island, Vermont, Washington.

Source: the agencies, sewer operators and EPA records named on each row and on the Sources page. Updated 2026-11-06 09:03 UTC.

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

Records in California, 2023, newest first
When	Report	Status
Nov 20 ’23	California State Water Resources Control Board (FHAB program) · Tomales Bay · Tomales Bay State Park Tomales Beach · Algae advisory · volume not reported · notice · map	listed
Oct 12 ’23	California State Water Resources Control Board (FHAB program) · “Alpine Pond” · Midpeninsula Open Space District Skyline Field Office · Algae advisory · volume not reported · notice · map	listed
Sep 29 ’23	California State Water Resources Control Board (FHAB program) · Peyton Slough · next to I680, across from WaterBird Regional Preserve · Algae advisory · volume not reported · notice · map	listed
Sep 28 ’23	California State Water Resources Control Board (FHAB program) · Lake Kaweah · Slick Rock · Algae advisory · volume not reported report · notice · map	to Nov 10, 8:00 PM PST
Sep 8 ’23	California State Water Resources Control Board (FHAB program) · “Little Truckee River” · Below Hwy 89 (636PS0246) · Algae advisory · volume not reported · notice · map	listed
Sep 1 ’23	California State Water Resources Control Board (FHAB program) · “Nobe Young Creek” · Nobe Young Creek ~0.2mi above Great Western Divide Hwy · Algae advisory · volume not reported · notice · map	listed
Aug 31 ’23	California State Water Resources Control Board (FHAB program) · “Cucamonga-Guasti Regional Park” · large lake · Algae advisory · volume not reported · notice · map	listed
Aug 31 ’23	California State Water Resources Control Board (FHAB program) · “Cucamonga-Guasti Regional Park” · small lake · Algae advisory · volume not reported · notice · map	listed
Aug 31 ’23	California State Water Resources Control Board (FHAB program) · “Pocket Canal” · Rambleoak Circle, City of Sacramento · Algae advisory · volume not reported · notice · map	listed
Aug 31 ’23	California State Water Resources Control Board (FHAB program) · “Pocket Canal” · St. Anthony's Church · Algae advisory · volume not reported · notice · map	listed
Aug 31 ’23	California State Water Resources Control Board (FHAB program) · “Yucaipa Regional Park” · Yucaipa Regional Park Lower Lake · Algae advisory · volume not reported · notice · map	listed
Aug 31 ’23	California State Water Resources Control Board (FHAB program) · “Yucaipa Regional Park” · Yucaipa Regional Park Middle Lake - SE corner · Algae advisory · volume not reported · notice · map	listed
Aug 30 ’23	California State Water Resources Control Board (FHAB program) · “Pleasant Valley Reservoir” · Pleasant Valley Dam · Algae advisory · volume not reported · notice · map	listed
Aug 29 ’23	California State Water Resources Control Board (FHAB program) · “Mountain Meadows Reservoir” · West End (South Shore) · Algae advisory · volume not reported · notice · map	listed
Aug 28 ’23	California State Water Resources Control Board (FHAB program) · Lake Britton · State Park Beach · Algae advisory · volume not reported · notice · map	listed
Aug 28 ’23	California State Water Resources Control Board (FHAB program) · Lake Britton · State Park Beach · Algae advisory · volume not reported · notice · map	listed
Aug 28 ’23	California State Water Resources Control Board (FHAB program) · Lake Britton · Jamo Boat Launch · Algae advisory · volume not reported · notice · map	listed
Aug 28 ’23	California State Water Resources Control Board (FHAB program) · Lake Britton · North Ferry Crossing · Algae advisory · volume not reported · notice · map	listed
Aug 27 ’23	California State Water Resources Control Board (FHAB program) · “Mountain meadows reservoir” · Indian Ole Rd west of town · Algae advisory · volume not reported · notice · map	listed
Aug 25 ’23to Dec 21 ’23	California State Water Resources Control Board (FHAB program) · “Temecula Creek (2.52)” · near I-15 · Algae advisory · volume not reported · notice · map	lifted
Aug 25 ’23	California State Water Resources Control Board (FHAB program) · Morena Reservoir · Lake Morena County Park · Algae advisory · volume not reported report · notice · map	to Nov 8, 8:00 PM PST
Aug 8 ’23	California State Water Resources Control Board (FHAB program) · San Francisco Bay · Palace of fine arts, crissy field, E beach · Algae advisory · volume not reported · notice · map	listed
Aug 4 ’23	California State Water Resources Control Board (FHAB program) · Big Bear Lake · Big Bear at Lagonita Point · Algae advisory · volume not reported · notice · map	listed
Aug 1 ’23	California State Water Resources Control Board (FHAB program) · Canyon Lake · Causeway between backwater and Canyon Lake · Algae advisory · volume not reported · notice · map	listed
Jul 28 ’23	California State Water Resources Control Board (FHAB program) · Santa Ana River · In Between Big Bear And Lake Arrowhead · Algae advisory · volume not reported · notice · map	listed
Jul 26 ’23	California State Water Resources Control Board (FHAB program) · “Bethel Island” · Stone Rd. and Sea Drift Dr. · Algae advisory · volume not reported · notice · map	listed
Jul 24 ’23	California State Water Resources Control Board (FHAB program) · Red Lake · Shoreline Point 2 (633RLS02) · Algae advisory · volume not reported · notice · map	listed
Jul 14 ’23to Dec 21 ’23	California State Water Resources Control Board (FHAB program) · San Marcos Creek · Lake San Marcos · Algae advisory · volume not reported · notice · map	lifted
Jul 11 ’23	California State Water Resources Control Board (FHAB program) · Lake Tahoe · Slalom Court (Site H) · Algae advisory · volume not reported · notice · map	listed
Jul 11 ’23	California State Water Resources Control Board (FHAB program) · Lake Tahoe · Spinnaker Cove (Site 7) · Algae advisory · volume not reported · notice · map	listed
Jun 27 ’23	California State Water Resources Control Board (FHAB program) · “Delta Coves” · Delta coves · Algae advisory · volume not reported · notice · map	listed
Jun 19 ’23	California State Water Resources Control Board (FHAB program) · Lake Tahoe · Emerald / Marconi West · Algae advisory · volume not reported · notice · map	listed
Jun 19 ’23	California State Water Resources Control Board (FHAB program) · Eagle Lake · Christie Day Use · Algae advisory · volume not reported · notice · map	listed
Jun 19 ’23	California State Water Resources Control Board (FHAB program) · Red Lake · Shoreline Point 1 (633RLS01) · Algae advisory · volume not reported · notice · map	listed
Jun 13 ’23	California State Water Resources Control Board (FHAB program) · Bridgeport Reservoir · RV Park · Algae advisory · volume not reported · notice · map	listed
Jun 13 ’23	California State Water Resources Control Board (FHAB program) · Bridgeport Reservoir · Old Marina Boat Ramp · Algae advisory · volume not reported · notice · map	listed
Jun 13 ’23	California State Water Resources Control Board (FHAB program) · Bridgeport Reservoir · North East Corner of Dam · Algae advisory · volume not reported · notice · map	listed
Jun 11 ’23	California State Water Resources Control Board (FHAB program) · Lake Crowley · Hilton Creek Drainage · Algae advisory · volume not reported · notice · map	listed
Jun 11 ’23	California State Water Resources Control Board (FHAB program) · Lake Crowley · Marina · Algae advisory · volume not reported · notice · map	listed
Jun 9 ’23	California State Water Resources Control Board (FHAB program) · “San Clemente Creek” · San Clemente Creek ~0.5mi above Robinson Cyn. Rd. · Algae advisory · volume not reported · notice · map	listed
Jun 5 ’23	California State Water Resources Control Board (FHAB program) · Lake Isabella · Patterson Lane (12) · Algae advisory · volume not reported · notice · map	listed
Jun 5 ’23	California State Water Resources Control Board (FHAB program) · Lake Isabella · Hanning Flat (10) · Algae advisory · volume not reported · notice · map	listed
Jun 1 ’23	California State Water Resources Control Board (FHAB program) · Lower Otay Reservoir · reservoir-wide · Algae advisory · volume not reported · notice · map	listed
May 26 ’23	California State Water Resources Control Board (FHAB program) · “Quarry Lakes” · Rainbow Lake · Algae advisory · volume not reported report · notice · map	to Nov 12, 8:00 PM PST
May 26 ’23	California State Water Resources Control Board (FHAB program) · Salton Sea · Bombay Beach · Algae advisory · volume not reported · notice · map	listed
May 26 ’23	California State Water Resources Control Board (FHAB program) · Salton Sea · Salton Sea State Recreation Area · Algae advisory · volume not reported · notice · map	listed
May 25 ’23	California State Water Resources Control Board (FHAB program) · Eagle Lake · Merrill Campground · Algae advisory · volume not reported · notice · map	listed
May 23 ’23	California State Water Resources Control Board (FHAB program) · San Diego River · at YMCA · Algae advisory · volume not reported · notice · map	listed
May 23 ’23to Dec 21 ’23	California State Water Resources Control Board (FHAB program) · “San Dieguito River” · Arroyo Preserve Park · Algae advisory · volume not reported · notice · map	lifted
May 22 ’23to Dec 21 ’23	California State Water Resources Control Board (FHAB program) · Agua Hedionda Creek · pond in San Marcos · Algae advisory · volume not reported · notice · map	lifted
May 22 ’23to Dec 21 ’23	California State Water Resources Control Board (FHAB program) · “Black Mountain Creek” · at bedrock section · Algae advisory · volume not reported · notice · map	lifted
May 18 ’23to Dec 21 ’23	California State Water Resources Control Board (FHAB program) · Sweetwater River · above Sweetwater River · Algae advisory · volume not reported · notice · map	lifted
May 11 ’23	California State Water Resources Control Board (FHAB program) · Lake Elsinore · Perret Park · Algae advisory · volume not reported · notice · map	listed
May 11 ’23to Dec 31 ’22	California State Water Resources Control Board (FHAB program) · H. V. Eastman Lake · East Boat Ramp · Algae advisory · volume not reported · notice · map	lifted
May 11 ’23to Dec 31 ’22	California State Water Resources Control Board (FHAB program) · Hensley Lake · at East Floating Dock · Algae advisory · volume not reported · notice · map	lifted
May 10 ’23	California State Water Resources Control Board (FHAB program) · San Francisco Bay · Southwest shorline of Berkeley Aquatic Park · Algae advisory · volume not reported · notice · map	listed
May 8 ’23to Dec 21 ’23	California State Water Resources Control Board (FHAB program) · “Sheffield Park” · Sheffield Park south end flooded creek · Algae advisory · volume not reported · notice · map	lifted
May 4 ’23	California State Water Resources Control Board (FHAB program) · Lodi Lake · east side of lake · Algae advisory · volume not reported · notice · map	listed
May 4 ’23	California State Water Resources Control Board (FHAB program) · “Phantom Falls creek” · Phantom Falls in North Table Mountain Ecological Reserve, Gold Run · Algae advisory · volume not reported · notice · map	listed
May 2 ’23	California State Water Resources Control Board (FHAB program) · San Luis Reservoir · Pacheco Pumping Plant · Algae advisory · volume not reported · notice · map	listed
Apr 13 ’23	California State Water Resources Control Board (FHAB program) · Indian Creek Reservoir · Auxiliary Dam (ICR-CB03) · Algae advisory · volume not reported · notice · map	listed
Apr 11 ’23	California State Water Resources Control Board (FHAB program) · Lake Tahoe · Star Harbor · Algae advisory · volume not reported · notice · map	listed
Feb 13 ’23	California State Water Resources Control Board (FHAB program) · Lake Chabot · Lake Chabot · Algae advisory · volume not reported · notice · map	listed
Feb 10 ’23	California State Water Resources Control Board (FHAB program) · Lake Elsinore · mid-lake (city site) · Algae advisory · volume not reported · notice · map	listed
Feb 10 ’23	California State Water Resources Control Board (FHAB program) · Lake Elsinore · West Marina (city site) · Algae advisory · volume not reported · notice · map	listed
Feb 10 ’23	California State Water Resources Control Board (FHAB program) · Lake Elsinore · Launch Pointe Boat Ramp (city site) · Algae advisory · volume not reported · notice · map	listed
Feb 10 ’23	California State Water Resources Control Board (FHAB program) · Lake Elsinore · Elm Grove Beach (city site) · Algae advisory · volume not reported · notice · map	listed
Jan 27 ’23	California State Water Resources Control Board (FHAB program) · “Big Break Regional Shoreline” · Boat launch · Algae advisory · volume not reported · notice · map	listed
Jan 17 ’23	California State Water Resources Control Board (FHAB program) · Lake Perris · Lake Perris mid lake · Algae advisory · volume not reported · notice · map	listed
Jan 9 ’23	California State Water Resources Control Board (FHAB program) · San Luis Reservoir · Dinosaur Point Boat Launch · Algae advisory · volume not reported report · notice · map	to Nov 17, 9:00 PM PST
Jan 4 ’23	California State Water Resources Control Board (FHAB program) · Tule Lake · Sump 1A near levee · Algae advisory · volume not reported · notice · map	listed
Jan 2 ’23to Feb 2 ’23	California State Water Resources Control Board (FHAB program) · “Cedar Creek” · Cedar Creek at the falls · Algae advisory · volume not reported · notice · map	lifted
Jan 2 ’23	California State Water Resources Control Board (FHAB program) · Pinto Lake · Pinto Lake Boat Launch (PLS5) · Algae advisory · volume not reported · notice · map	listed
Jan 2 ’23	California State Water Resources Control Board (FHAB program) · Lake Elsinore · Launch Pointe NE dock end · Algae advisory · volume not reported · notice · map	listed
Jan 2 ’23	California State Water Resources Control Board (FHAB program) · Big Bear Lake · Duane Boyer Dock (West Ramp)-801BBL706 · Algae advisory · volume not reported · notice · map	listed
Jan 2 ’23	California State Water Resources Control Board (FHAB program) · Big Bear Lake · Carol Morrison dock (East Ramp)-801BBL705 · Algae advisory · volume not reported · notice · map	listed
Jan 2 ’23	California State Water Resources Control Board (FHAB program) · Big Bear Lake · Big Bear Marina--801BBL704 · Algae advisory · volume not reported · notice · map	listed
Jan 2 ’23	California State Water Resources Control Board (FHAB program) · Big Bear Lake · Stanfield Middle near MWDL9-801BBL703 · Algae advisory · volume not reported · notice · map	listed
Jan 2 ’23	California State Water Resources Control Board (FHAB program) · Big Bear Lake · Mid Lake near MWDL6-801BBL702 · Algae advisory · volume not reported · notice · map	listed
Jan 2 ’23	California State Water Resources Control Board (FHAB program) · Big Bear Lake · Gilner Point Middle near MWDL2-801BBL701 · Algae advisory · volume not reported · notice · map	listed
Jan 1 ’23	California State Water Resources Control Board (FHAB program) · Lake Chabot · lake-wide · Algae advisory · volume not reported report · notice · map	to Nov 12, 8:00 PM PST
Jan 1 ’23	California State Water Resources Control Board (FHAB program) · “Lago Los Osos” · Lago Los Osos area · Algae advisory · volume not reported report · notice · map	to Nov 12, 8:00 PM PST
Jan 1 ’23	California State Water Resources Control Board (FHAB program) · Shadow Cliffs Lake · Shadow Cliffs Reservoir lake-wide · Algae advisory · volume not reported report · notice · map	to Nov 12, 8:00 PM PST
Jan 1 ’23	California State Water Resources Control Board (FHAB program) · “Quarry Lakes” · Quarry Lakes · Algae advisory · volume not reported · notice · map	listed
Jan 1 ’23	California State Water Resources Control Board (FHAB program) · Lake Temescal · Lake Temescal · Algae advisory · volume not reported report · notice · map	to Nov 12, 8:00 PM PST
Jan 1 ’23	California State Water Resources Control Board (FHAB program) · O'Neill Forebay · Boat Launch · Algae advisory · volume not reported report · notice · map	to Nov 17, 9:00 PM PST
Jan 1 ’23	California State Water Resources Control Board (FHAB program) · H. V. Eastman Lake · at west boat ramp 2 (539MAD420) · Algae advisory · volume not reported report · notice · map	to Nov 10, 8:00 PM PST
Jan 1 ’23	California State Water Resources Control Board (FHAB program) · H. V. Eastman Lake · at east boat ramp 1 (539MAD400) · Algae advisory · volume not reported report · notice · map	to Nov 10, 8:00 PM PST
Jan 1 ’23	California State Water Resources Control Board (FHAB program) · Hensley Lake · at East Floating Dock (539MAD002) · Algae advisory · volume not reported report · notice · map	to Nov 10, 8:00 PM PST
Jan 1 ’23	California State Water Resources Control Board (FHAB program) · Hensley Lake · at West Floating Dock (539MAD001) · Algae advisory · volume not reported report · notice · map	to Nov 10, 8:00 PM PST

Sources: Surface Water - Freshwater Harmful Algal Blooms, retrieved 2026-11-06 03:07 UTC. A report's record id and times show when you hover or focus its "report" link.