Florida Administrative Code › 62 - DEPARTMENT OF ENVIRONMENTAL PROTECTION › 62 - Departmental › Chapter 62-550 - DRINKING WATER STANDARDS, MONITORING, AND REPORTING › Section 62-550.518 - Microbiological Monitoring Requirements

Current through Reg. 50, No. 138; July 16, 2024
The provisions of subsections
				   62-550.518(1) through
				  (6), F.A.C., pertaining to distribution
				  system sampling or samples and the provisions of subsection
				   62-550.518(12),
				  F.A.C., are applicable until March 31, 2016. The provisions of subsections
				   62-550.518(7) through
				  (11), F.A.C., pertaining to distribution
				  system sampling or samples are applicable until all required repeat monitoring
				  under subsections  62-550.518(7) and
				  (8), F.A.C., and fecal coliform or
E.
				  coli
testing under subsection
				   62-550.518(10),
				  F.A.C., that was initiated by a total coliform-positive sample taken before
				  April 1, 2016, is completed, as well as analytical method, reporting,
				  recordkeeping public notification, and consumer confidence report requirements
				  associated with that monitoring and testing. Beginning April 1, 2016, the
				  provisions of  40 C.F.R. Part 141, Subpart Y, which is incorporated by reference
				  in Rule  62-550.830, F.A.C., are
				  applicable, with systems required to begin regular monitoring at the same
				  frequency as the system-specific frequency required on March 31, 2016.
				  (40 C.F.R. §
										141.21(h) revised as of July
				  1, 2014.) This introductory text shall be effective on July 7, 2015.
(1) All public water systems shall analyze
				for coliform bacteria to determine compliance with subsection
				 62-550.310(5),
				F.A.C. Public water systems shall collect total coliform samples at sites that
				are representative of water throughout the distribution system and in
				accordance with a written sampling plan that addresses location, timing,
				frequency and rotation period. These plans shall be available for review and
				possible revision on the occasion of a sanitary survey conducted by the
				Department. Descriptions of sampling locations shall be specific, i.e.,
				numbered street addresses or lot numbers. Pressure tank or plant tap samples
				are not acceptable for determining compliance.
(2) Total coliform samples shall be taken at
				regular intervals and in numbers proportionate to the population served by the
				system. Community water systems, non-transient non-community water systems,
				transient non-community water systems that are subpart H systems and transient
				non-community water systems that serve more than 1, 000 persons per day during
				any one month shall take monthly distribution system samples. In addition,
				systems that are using ground water not under the direct influence of surface
				water shall take a minimum of one monthly raw water sample that is
				representative of each ground water source (i.e., well) not under the direct
				influence of surface water. For purposes of this subsection, consecutive
				systems that receive any finished water originating from a subpart H system are
				considered subpart H systems. In no event shall the number of distribution
				system samples be less than as set forth below:
Minimum number of routine samples
Population Served
per month
25
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
to
more
480
(3)
				Transient non-community water systems using only ground water not under the
				direct influence of surface water and serving 1, 000 or fewer persons shall
				monitor at the rate of two distribution system samples in each calendar quarter
				during which the system provides water to the public. In addition, such systems
				shall take a minimum of one quarterly raw water sample that is representative
				of each ground water source (i.e., well).
(4) Public water systems shall collect
				distribution system samples at regular intervals throughout the month, except
				that a system that uses only ground water not under the direct influence of
				surface water and that serves 4, 900 persons or fewer may collect all required
				samples on a single day if the samples are taken from different
				sites.
(5) Subpart H systems in an
				interim period per subparagraph
				 62-550.817(2)(a) 
				2., F.A.C., until filtration is installed in compliance with  40 CFR 141, Subpart H, adopted by Rule 62-550.817, F.A.C., shall collect at least one total
				coliform sample near the first service connection each day the turbidity level
				of the source water exceeds one NTU, measured as specified in
				40 CFR
				141.74(b)(2), adopted by
				Rule 62-550.817, F.A.C. This sample shall be analyzed for the presence of total
				coliforms. When any turbidity measurement in any day exceeds one NTU, the
				system shall collect this coliform sample within 24 hours unless the Department
				determines that the system, for logistical reasons outside the system's
				control, cannot have the sample analyzed within 30 hours of collection. In this
				case, the Department shall specify how much time the system has to collect the
				sample. Sample results from this coliform monitoring shall be included in
				determining compliance with the maximum contaminant level for total coliforms
				in subsection  62-550.310(5),
				F.A.C.
(6) Special purpose samples,
				such as those taken to determine whether disinfection practices are sufficient
				following pipe placement, replacement, or repair, shall not be used to
				determine compliance with the maximum contaminant level for total coliforms in
				subsection  62-550.310(5),
				F.A.C. Repeat distribution system samples taken pursuant to subsection (7) of
				this section are not considered special purpose samples and shall be used to
				determine compliance with the maximum contaminant level for total coliforms in
				subsection  62-550.310(5),
				F.A.C.
(7) Additional or Repeat
				Monitoring.
(a) If a raw water sample is
				total-coliform-positive, the public water system shall disinfect and
				bacteriologically survey the relevant well(s) in accordance with subsection
				 62-555.315(6),
				F.A.C., when notified in writing by the Department to do so and shall conduct
				physical characteristics monitoring in accordance with subsection
				 62-550.517(2),
				F.A.C., when notified in writing by the Department to do so.
(b) If a routine distribution system sample
				is total-coliform-positive, the public water system shall collect a set of
				repeat distribution system samples within 24 hours of being notified of the
				positive result. The system shall collect all repeat samples on the same day. A
				system that collects monthly routine samples shall collect no fewer than three
				repeat samples for each total-coliform-positive sample found. A transient
				non-community water system that collects quarterly routine samples shall
				collect no fewer than four repeat samples for each total-coliform-positive
				sample found. The Department shall extend the 24-hour limit on a case-by-case
				basis if the system has a logistical problem that is beyond its control in
				collecting the repeat samples within 24 hours. If an extension is granted, the
				Department shall specify how much time the system has to collect the repeat
				samples. If a routine distribution system sample is total-coliform-positive and
				the public water system is collecting fewer than five routine distribution
				system samples per month, the system also shall comply with the sampling
				requirements in subsection
				 62-550.518(8),
				F.A.C.
(c) The system shall collect
				at least one repeat distribution system sample from the sampling tap where the
				original total-coliform-positive sample was taken, at least one repeat
				distribution system sample at a tap within five service connections upstream of
				the original sampling site, and at least one repeat distribution system sample
				at a tap within five service connections downstream of the original sampling
				site. If a total-coliform-positive sample is at the beginning or end of the
				distribution system, or one service connection away from the beginning or end
				of the distribution system, the system need not collect a repeat sample
				upstream or downstream of the original sampling site, whichever is applicable,
				but still must collect the total number of repeat samples specified in
				paragraph (b) above.
(d) If any
				repeat distribution system sample in the set is total-coliform-positive the
				public water system shall collect an additional set of repeat distribution
				system samples in the manner specified in paragraphs (7)(b) and (c) of this
				section. The public water system shall collect the additional samples within 24
				hours of being notified of the positive result unless the Department extends
				the limit as provided in paragraph (7)(b) of this section. The system shall
				repeat this process until either total coliforms are not detected in one
				complete set of repeat samples or the system determines that the maximum
				contaminant level for total coliforms in subsection
				 62-550.310(5),
				F.A.C., has been exceeded and notifies the Department in accordance with
				subsections (10) and (11) below.
(e) Results of all routine and repeat
				distribution system samples not invalidated by the Department shall be included
				in determining compliance with the maximum contaminant level for total
				coliforms in subsection
				 62-550.310(5),
				F.A.C.