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Layer: P90 Scores 2023 (5)


Name: P90 Scores 2023

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Description:

The Department of Marine Resources (DMR) Bureau of Public Health works year round to collect samples at approximately 1,400 water quality stations along the Maine coast. At each station, after at least 30 samples have been collected under systematic random sampling and analyzed for fecal coliforms, DMR scientists calculate final scores which, along with sanitary surveys of the area, help determine whether the water quality is acceptable for harvesting shellfish. Fecal coliform results are reported as the number of colony forming units (individual bacterium capable of forming colonies) per 100mL of water. Most sample sites show a range of scores, and some sites may have high as well as low scores.

The DMR Shellfish Growing Area Classification Program classifies shellfish areas as Approved, Conditionally Approved, Restricted, Conditionally Restricted or Prohibited using standards set by the National Shellfish Sanitation Program (NSSP), a federal/state cooperative program that sets the requirements for all states involved in interstate shellfish harvest and sale. For more information about the classification of shellfish flats, visit http://www.maine.gov/dmr/shellfish-sanitation-management/programs/growingareas/index.html.

All classifications are based on two factors: the results of a shoreline survey which looks for the presence of pollution sources and fecal coliform test results. Two statistical values are calculated from the most recent 30 fecal scores: the geometric mean (geomean) and the 90th percentile (P90). The standards for Approved are 14 or less (geomean) and 31 or less (P90). The standards for Restricted are 88 or less (geomean) and 163 or less (P90). The standards for Prohibited are greater than 88 (geomean) and greater than 163 (P90).

End of year 20xx P90 data for all Maine active water quality stations based on the most recent 30 samples. Conditional Area stations are based on last 30 samples in the open status. Data projection is NAD 1983 UTM Zone 19N.



Copyright Text: Data complied by Maine DMR Public Health staff. For more information or questions, contact either Western Maine Shellfish Growing Area Program Supervisor at 207-633-9500 or Eastern Maine Shellfish Growing Area Program Supervisor at 207-667-5654.

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Last Edit Date: 10/1/2024 4:43:34 PM

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