R 325.10704g Total coliform; routine monitoring; community and noncommunity; serving more than 1,000 people.

Rule 704g. (1) General total coliform rules routine monitoring requirements are all of the following: (a) This rule applies to community and noncommunity water supplies serving more than 1,000 persons. (b) Following a total coliform-positive sample taken under this rule, supplies shall comply with the repeat monitoring requirements and E. coli analytical requirements in R 325.10704h. (c) Once all monitoring required by this rule and R 325.10704h for a calendar month has been completed, supplies shall determine whether 1 or more coliform treatment technique triggers in R 325.10704i have been exceeded. If a trigger has been exceeded, supplies shall complete assessments under R 325.10704i. (d) Seasonal supplies shall comply with both of the following: (i) Beginning April 1, 2016, all seasonal supplies shall complete the department- approved start-up procedure, which may include a requirement for startup sampling, and submit a certification to the department, before serving water to the public, that it has completed the department-approved start-up procedures. (ii) The department may exempt a seasonal supply from some or all of the requirements for seasonal supplies if the entire distribution system remains pressurized during the entire period that the supply is not operating. (2) The monitoring frequency for total coliforms is based on the population served by the supply, as follows: Total Coliform Monitoring Frequency for Community and Noncommunity Water Supplies Serving More Than 1,000 People Population served Minimum number of samples per month 1,001 to 2,500 2 2,501 to 3,300 3 3,301 to 4,100 4 4,101 to 4,900 5 4,901 to 5,800 6 5,801 to 6,700 7 6,701 to 7,600 8 7,601 to 8,500 9 8,501 to 12,900 10 12,901 to 17,200 15 17,201 to 21,500 20 21,501 to 25,000 25 25,001 to 33,000 30 33,001 to 41,000 40 41,001 to 50,000 50 50,001 to 59,000 60 59,001 to 70,000 70 70,001 to 83,000 80 83,001 to 96,000 90 96,001 to 130,000 100 130,001 to 220,000 120 220,001 to 320,000 150 320,001 to 450,000 180 450,001 to 600,000 210 600,001 to 780,000 240 780,001 to 970,000 270 970,001 to 1,230,000 300 1,230,001 to 1,520,000 330 1,520,001 to 1,850,000 360 1,850,001 to 2,270,000 390 2,270,001 to 3,020,000 420 3,020,001 to 3,960,000 450 3,960,001 or more 480 (3) Supplies shall not reduce monitoring, except for noncommunity water supplies using only ground water, and not ground water under the direct influence of surface water, serving 1,000 or fewer people in some months and more than 1,000 persons in other months. In months when more than 1,000 persons are served, the supplies shall monitor at the frequency in subrule (2) of this rule. In months when 1,000 or fewer people are served, the department may reduce the monitoring frequency, in writing, to a frequency allowed under R 325.10704d for a similarly situated supply that always serves 1,000 or fewer people, considering the requirements of R 325.10704d(5) to (7).