40 CFR 141.31 - Drinking Water 
                                           Reporting
      • A Public Water System (PWS) must report to its state, 
        except in Wyoming.
      • PWSs in Wyoming report to EPA Region 8.
      • States may impose more stringent reporting 
        requirements. 
      • Non-PWS have no Federal reporting requirements.
                                 
  40 CFR 141.31 - Drinking Water 
                                   Reporting 
      (a) The PWS must report monitoring results 
        within the first 10 days following the month 
        in which the results were received.
      (b) The PWS must report within 48 hours, the 
        failure to comply with any National Primary 
        Drinking Water Regulation [40 CFR 141], 
        include failure to comply with monitoring 
        requirements.
                               
  40 CFR 141.31 - Drinking Water 
                                    Reporting 
      (c) Monitoring results from a state laboratory 
        or lab certified by the state do not need to 
        be submitted, if the lab sends the analytical 
        results to the state office that regulates 
        drinking water.
                                
   40 CFR 141.31 - Drinking Water 
                                      Reporting 
    (d) If the PWS violates a MCL, a copy of the 
       public notification required by 40 CFR 
       141.32 must be submitted within 10 days.
    (e) The PWS shall submit a copy of any 
       record (e.g., sanitary survey, consultant 
       report) required to be maintained by 40 
       CFR 141.33 in the time period specified by 
       the state.
                                 
       40 CFR 141.33(a) - Drinking 
                 Water Recordkeeping 
     • The records must be kept at the PWS or 
       at a convenient location near the PWS.
     • Bacteriological records shall be kept 
       not less than 5 years.
     • Chemical analyses records shall be kept 
       not less than 10 years.