Routine Monitoring Requirements for PWSs That Serve More Than 1,000 People

Section 611.1057  Routine Monitoring Requirements for PWSs That Serve More Than 1,000 People a)         General 1)         The provisions of this Section apply to public water systems serving more than 1,000 persons. 2)         Following any total coliform-positive sample taken under the provisions of this Section, the supplier must comply with the repeat monitoring requirements and E. coli analytical requirements in Section 611.1058. 3)         Once all monitoring required by this Section and Section 611.1058 for a calendar month has been completed, a supplier must determine whether any coliform treatment technique triggers specified in Section 611.1059 have been exceeded.  If any trigger has been exceeded, the supplier must complete assessments as required by Section 611.1059. 4)         Seasonal Systems A)        A seasonal system supplier must demonstrate completion of an Agency-approved start-up procedure, which may include a requirement for start-up sampling prior to serving water to the public. B)        The Agency may, by a SEP, exempt any seasonal system supplier from some or all of the requirements for seasonal system suppliers if the supplier's entire distribution system remains pressurized during the entire period that the supplier's system is not operating. b)         Monitoring Frequency for Total Coliforms.  The monitoring frequency for total coliforms is based on the population served by the supplier's system, as follows: Total Coliform Monitoring Frequency for Public Water Systems 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 c)         Unfiltered Subpart B Systems.  A Subpart B system supplier that does not practice filtration in compliance with Subparts B, R, X, and Z must collect at least one total coliform sample near the first service connection each day that the turbidity level of the source water, measured as specified in Section 611.532(b), exceeds 1 NTU.  When one or more turbidity measurements in any day exceed 1 NTU, the supplier must collect this coliform sample within 24 hours after the first exceedance, unless the Agency determines that the supplier, for logistical reasons outside the supplier's control, cannot have the sample analyzed within 30 hours after collection, and the Agency identifies an alternative sample collection schedule.  Sample results from this coliform monitoring must be included in determining whether the coliform treatment technique trigger in Section 611.1059 has been exceeded. d)         Reduced Monitoring.  A supplier may not reduce monitoring, except for a non-CWS supplier that uses only ground water (and not ground water under the direct influence of surface water) and which serves 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 supplier must monitor at the frequency specified in subsection (a).  In months when the supplier serves 1,000 or fewer people, the Agency may, by a SEP, reduce the monitoring frequency, in writing, to a frequency allowed under Section 611.1054 for a similarly situated supplier that always serves 1,000 or fewer people, taking into account the provisions in Section 611.1054(e) through (g). BOARD NOTE:  Derived from 40 CFR 141.857.