Prior Lake follows Minnesota Pollution Control Agency noise standards under Minn. Rules 7030.0040. Residential receiving property is capped at L50 60 dBA daytime / 50 dBA nighttime; the L10 cap (10% of any hour) is 65 dBA day / 55 dBA night.
Minn. Rules 7030.0040 establishes the state's adopted noise limits, which Prior Lake uses for enforcement of noise complaints under its public nuisance code. The metrics are L50 (the noise level exceeded 50% of the time during a 1-hour sample) and L10 (exceeded 10% of the time). At residential receiving property (Noise Area Classification 1, NAC-1): daytime 7 a.m. to 10 p.m. is L50 60 / L10 65 dBA; nighttime 10 p.m. to 7 a.m. is L50 50 / L10 55 dBA. At commercial receiving (NAC-2): L50 65 / L10 70 day, L50 60 / L10 65 night. At industrial receiving (NAC-3): L50 75 / L10 80 day, L50 75 / L10 80 night. Measurements are taken at the receiving property line, not the source.
Noise above the MPCA limits is a public nuisance misdemeanor under Prior Lake code with fines up to $1,000 per day, plus potential MPCA civil penalties up to $10,000.
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