Section R. 325.10704g - Total coliform; routine monitoring; community and noncommunity; serving more than 1,000 peopleRule 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).Mich. Admin. Code R. 325.10704g
2015 MR 20, Eff. 10/16/2015