Water Quality Test Results

Ocean Monitoring
Humboldt County is funded by the U.S. Environmental Protection Agency Beach Environmental Assessment and Coastal Health Act (BEACH Act) to monitor for the presence of bacteria in ocean water areas. Water samples are taken near creek mouths that deliver stormwater into the ocean.

Current Results
No Beaches are currently posted. 

Water quality test results by location and date.
Locations Resample Sample  Date 
E.Coli Exceeds
Enterococcus Exceeds
North Mad River Mouth No 6/27/2022 109 No <10 No 10 No
Clam Beach/Strawberry Creek No 6/27/2022 2,489 No 62 No 74 No
Moonstone Beach/Little River No 6/27/2022 262 No 10 No 10 No
Luffenholtz Beach/Creek No 6/27/2022 327 No 31 No 31 No
Trinidad State Park/Mill Creek No 6/27/2022 20 No 10 No <10 No

Previous results are available for download (XLS).


All units are in are in MPN/100 ml. MPN = "most probable number".

State water quality standards for bacteria in recreational waters are not to exceed:

  • Total coliform = 10,000 MPN/100ml*
  • E. coli (a fecal coliform) = 400 MPN/100 ml
  • Enterococcus (E. faecalis) = 104 MPN/100 ml

*Fecal coliform to total coliform ratio exceeds 0.1, and the total coliform count exceeds 1,000 MPN

NOWCAST Predictions

NOWCAST Predictive Modeling now includes Luffenholtz Beach. Visit beachreportcard.org and enter "Luffenholtz" into the "search for your favorite beach" form field.

For more information, visit beachreportcard.org.