62-550.310. Primary Drinking Water Standards: Maximum Contaminant Levels and Maximum Residual Disinfectant Levels  


Effective on Tuesday, July 7, 2015
  • 1(These standards may also apply as ground water quality standards as referenced in Chapter 62-520, F.A.C.)

    17(1) Inorganics – Except for nitrate and nitrite, which apply to all public water systems, this subsection applies to community water systems and non-transient non-community water systems only.

    45(a) The maximum contaminant levels for the inorganic contaminants are listed in Table 1, which is incorporated herein and appears at the end of this chapter.

    71(b) The maximum contaminant level for nitrate (as N) applicable to transient non-community water systems is 10 milligrams per liter. The Department or Approved County Health Department shall allow a contaminant level for nitrate (as N) of up to 20 milligrams per liter upon a showing by the supplier of water that the following conditions are met:

    1281. The water distributed by the water system is not available to children under 6 months of age or to lactating mothers, and

    1512. There is continuous public notification of what the nitrate level (as N) is and what the potential health effects of such exposure are.

    1753. The Department shall require monitoring every 3 months as long as the maximum contaminant level is exceeded. Should adverse health effects occur, the Department shall require immediate compliance with the maximum contaminant level for nitrate (as N).

    213(c) The revised maximum contaminant level of 0.010 mg/L for arsenic becomes effective January 1, 2005. All community and non-transient non-community water systems shall demonstrate compliance with the revised maximum contaminant level by December 31, 2007.

    249(2) Disinfectant Residuals.

    252(a) Maximum residual disinfectant levels (MRDLs) are as follows:

    261DISINFECTANT RESIDUAL

    263MRDL

    264Chlorine

    2654.0 mg/L (as Cl2692270)

    271Chloramines

    2724.0 mg/L (as Cl2762277).

    278Chlorine Dioxide

    2800.8 mg/L (as ClO2842285).

    286(28740 C.F.R. § 141.65(a) 291(July 1, 2011))

    294(b) Compliance dates – community water systems and non-transient non-community water systems. (30740 C.F.R. §141.65(b) 310(July 1, 2011))

    3131. Subpart H systems serving 10,000 or more persons must comply with paragraph (a) above beginning January 1, 2002. Subpart H systems serving fewer than 10,000 persons and systems using only ground water not under the direct influence of surface water must comply with paragraph (a) above beginning January 1, 2004. 366(36740 C.F.R. §141.65(b)(1) 370(July 1, 2011))

    3732. If you are a consecutive system that does not add a disinfectant but delivers water that has been treated with a primary or residual disinfectant other than ultraviolet light, you must comply with analytical and monitoring requirements for chlorine and chloramines in 41640 C.F.R. §141.131(c) 419and §141.132(c)(1) (which are incorporated by reference in subsection 42862-550.550(1), 429F.A.C., and Rule 43262-550.821, 433F.A.C.) and the compliance requirements in 43940 C.F.R. §141.133(c)(1) 442(which is incorporated by reference in Rule 44962-550.821, 450F.A.C.) beginning April 1, 2009, and report monitoring results under 46040 C.F.R. §141.134(c) 463(which is incorporated by reference in Rule 47062-550.821, 471F.A.C.). 472(47340 C.F.R. §141.624 476(July 1, 2011))

    479(c) Compliance dates – transient non-community water systems. Subpart H systems serving 10,000 or more persons and using chlorine dioxide as a disinfectant or oxidant must comply with the chlorine dioxide MRDL beginning January 1, 2002. Subpart H systems serving fewer than 10,000 persons and using chlorine dioxide as a disinfectant or oxidant and systems using only ground water not under the direct influence of surface water and using chlorine dioxide as a disinfectant or oxidant must comply with the chlorine dioxide MRDL beginning January 1, 2004. 568(56940 C.F.R. §141.65(b)(2) 572(July 1, 2011))

    575(3) Disinfection Byproducts.

    578(a) Bromate and chlorite. (58340 C.F.R. §141.64(a) 586(July 1, 2011))

    5891. The maximum contaminant levels (MCLs) for bromate and chlorite are as follows:

    602DISINFECTION BYPRODUCT

    604MCL

    605Bromate

    6060.010 mg/L

    608Chlorite

    6091.0 mg/L

    611(61240 C.F.R. §141.64(a) 615(July 1, 2011))

    6182. Compliance dates for community water systems and non-transient non-community water systems. Subpart H systems serving 10,000 or more persons must comply with subparagraph 1. above beginning January 1, 2002. Subpart H systems serving fewer than 10,000 persons and systems using only ground water not under the direct influence of surface water must comply with subparagraph 1. above beginning January 1, 2004. 682(68340 C.F.R. §141.64(a)(1) 686(July 1, 2011))

    689(b) Total trihalomethanes (TTHM) and haloacetic acids (five) (HAA5). (69940 C.F.R. §141.64(b) 702(July 1, 2011))

    7051. Subpart L (Stage 1) – running annual average compliance. (71640 C.F.R. §141.64(b)(1) 719(July 1, 2011))

    722a. Compliance dates for community water systems and non-transient non-community water systems. Subpart H systems serving 10,000 or more persons must comply with this sub-subparagraph beginning January 1, 2002. Subpart H systems serving fewer than 10,000 persons and systems using only ground water not under the direct influence of surface water must comply with this sub-subparagraph beginning January 1, 2004. All systems must comply with these maximum contaminant levels (MCLs) as a running annual average until the date specified for 80440 C.F.R. Part 141, 808Subpart V (Stage 2), compliance in 81440 C.F.R. §141.620(c) 817(which is incorporated by reference in Rule 82462-550.822, 825F.A.C.).

    826DISINFECTION BYPRODUCT

    828MCL

    829TTHM

    8300.080 mg/L

    832HAA5

    8330.060 mg/L

    835(83640 C.F.R. §141.64(b)(1)(i) 839(July 1, 2011))

    842b. The regulations in 84640 C.F.R. Part 849141, Subpart L (as incorporated in Rule 85662-550.821, 857F.A.C.) establish criteria under which community water systems and non-transient non-community water systems that add a chemical disinfectant to the water in any part of the drinking water treatment process must modify their practices to meet MCLs in 89540 C.F.R. §141.64 898(which is incorporated in subsection 90362-550.310(3), 904F.A.C.). 905(90640 C.F.R. §141.130(a)(1) 909(July 1, 2011))

    9122. Subpart V (Stage 2) – locational running annual average (LRAA) compliance. (92540 C.F.R. §141.64(b)(2) 928(July 1, 2011))

    931a. Compliance dates for community water systems and non-community water systems. The subpart V maximum contaminant levels (MCLs) for TTHM and HAA5 must be complied with as an LRAA at each monitoring location beginning the date specified for 96940 C.F.R. part 141, 973subpart V, compliance in 97740 C.F.R. §141.620(c) 980(which is incorporated by reference in Rule 98762-550.822, 988F.A.C.).

    989DISINFECTION BYPRODUCT

    991MCL

    992TTHM

    9930.080 mg/L

    995HAA5

    9960.060 mg/L

    998(99940 C.F.R. §141.64(b)(2)(i) 1002(July 1, 2011))

    1005b. The regulations in 100940 C.F.R. Part 1012141, Subpart V (which is incorporated by reference in Rule 102262-550.822, 1023F.A.C.), establish monitoring and other requirements for achieving compliance with maximum contaminant levels based on LRAAs for TTHM and HAA5. You are subject to these requirements if your system is a community water system or a non-transient non-community water system that uses a primary or residual disinfectant other than ultraviolet light or delivers water that has been treated with a primary or residual disinfectant other than ultraviolet light. 1091(109240 C.F.R. §141.620(a) 1095and (b) (July 1, 2011)).

    1100(4) Organics – This subsection applies only to community water systems and non-transient non-community water systems.

    1116(a) The maximum contaminant levels for the volatile organic contaminants (VOCs) are listed in Table 4, which is incorporated herein and appears at the end of this chapter. The regulatory detection limit (RDL) for all VOCs is 0.0005 mg/L.

    1155(b) The maximum contaminant levels and the regulatory detection limits (RDLs) for the synthetic organic contaminants (SOCs) are listed in Table 5, which is incorporated herein and appears at the end of this chapter.

    1189(5) Microbiological – This subsection applies to all public water systems. Until March 31, 2016, 1204monitoring requirements to demonstrate compliance with this subsection are defined in Rule 121662-550.518, 1217F.A.C. Beginning April 1, 2016, monitoring requirements to demonstrate compliance with this subsection are defined in Rule 62-550.830, F.A.C. This subsection shall be effective on July 7, 2015.

    1245(a) Until March 31, 2016, the total coliform MCL is based on the presence or absence of total coliforms in a sample, rather than coliform density. (127240 C.F.R. §141.63(b) 1275revised as of July 1, 2014.) For the purpose of the public notice requirements in Rule 129162-560.410, 1292F.A.C., a violation of the standards in this paragraph poses a non-acute risk to health. This paragraph shall be effective on July 7, 2015.

    13161. For a system which collects at least 40 samples per month, if no more than 5.0 percent of the samples collected during a month are total coliform-positive, the system is in compliance with the maximum contaminant level for total coliforms.

    13572. For a system which collects fewer than 40 samples per month, if no more than one sample collected during a month is total coliform-positive, the system is in compliance with the maximum contaminant level for total coliforms.

    1395(b) Until March 31, 2016, any fecal coliform-positive repeat sample or 1406E. coli1408-positive repeat sample, or any total coliform-positive repeat sample following a fecal coliform-positive or 1422E. coli1424-positive routine sample is a violation of the MCL for total coliforms. For the purposes of the public notification requirements in Rule 144662-560.410, 1447F.A.C., this is a violation that poses an acute risk to health. (146040 C.F.R. §141.63(b) 1463revised as of July 1, 2014.) This paragraph shall be effective on July 7, 2015.

    1478(c) Until March 31, 2016, a public water system shall determine compliance with the MCL for total coliforms in paragraphs (a) and (b) of this subsection for each month in which it is required to monitor for total coliforms. (151840 C.F.R. §141.63(d) 1521revised as of July 1, 2014.) This paragraph shall be effective on July 7, 2015.

    1536(d) Beginning April 1, 2016, a system is in compliance with the MCL for 1550E. coli 1552for samples taken under the provisions of 155940 C.F.R. Part 141, 1563Subpart Y, which is incorporated by reference in Rule 62.550.830, F.A.C., unless any of the conditions identified in the following subparagraphs 1. through 4. occur. For purposes of the public notification requirements in 159640 C.F.R. Part 141, 1600Subpart Q, which is incorporated by reference in Rule 160962-560.410, 1610F.A.C., violation of the MCL may pose an acute risk to health. (162340 C.F.R. §141.63(c) 1626revised as of July 1, 2014.) This paragraph shall be effective on July 7, 2015.

    16411. The system has an 1646E. coli1648-positive repeat sample following a total coliform-positive routine sample. (165840 C.F.R. §141.63(c)(1) 1661revised as of July 1, 2014.) This subparagraph shall be effective on July 7, 2015.

    16762. The system has a total coliform-positive repeat sample following an 1687E. coli1689-positive routine sample. (169340 C.F.R. §141.63(c)(2) 1696revised as of July 1, 2014.) This subparagraph shall be effective on July 7, 2015.

    17113. The system fails to take all required repeat samples following an 1723E. coli1725-positive routine sample. (172940 C.F.R. §141.63(c)(3) 1732revised as of July 1, 2014.) This subparagraph shall be effective on July 7, 2015.

    17474. The system fails to test for 1754E. coli 1756when any repeat sample tests positive for total coliform. (176640 C.F.R. §141.63(c)(4) 1769revised as of July 1, 2014.) This subparagraph shall be effective on July 7, 2015.

    1784(e) Beginning April 1, 2016, a public water system must determine compliance with the MCL for 1800E. coli 1802in paragraph 180462-550.310(5)(d), 1805F.A.C., for each month in which it is required to monitor for total coliforms. (182040 C.F.R. §141.63(d) 1823revised as of July 1, 2014.) This paragraph shall be effective on July 7, 2015.

    1838(6) Radionuclides – This subsection applies to community and nontransient noncommunity water systems. The following are the maximum contaminant levels (MCLs) and regulatory detection limits (RDLs) for radionuclides:

    1866(a) Naturally occurring radionuclides:

    1870MAXIMUM CONTAMINANT LEVELS

    1873FOR RADIONUCLIDES

    1875CONTAMINANT

    1876MAXIMUM CONTAMINANT LEVEL

    1879Combined radium226 and radium228

    18835 pCi/L

    1885Gross alpha particle activity including radium226 but excluding radon and uranium

    189615 pCi/L

    1898Uranium

    189930 ug/L

    1901pCi/L = picoCuries per liter

    1906ug/L = micrograms per liter

    1911(b) Man-made radionuclides:

    19141. The average annual concentration of beta particle and photon radioactivity from man-made radionuclides in drinking water shall not produce an annual dose equivalent to the body or any internal organ greater than 4 millirem/year.

    19492. Except for those radionuclides listed below, the concentration of man-made radionuclides causing 4 mrem total body or organ dose equivalents shall be calculated on the basis of a 2 liter per day drinking water intake using the 168-hour data list in “Maximum Permissible Body Burdens and Maximum Permissible Concentration of Radionuclides in Air or Water for Occupational Exposure,” NBS Handbook 69 as amended August 1963, U. S. Department of Commerce 2021at 2022http://www.flrules.org/Gateway/reference.asp?No=Ref-04137, 2024which is incorporated herein by 2029reference2030.

    2031Average Annual Concentration Assumed to Produce

    2037an Exposure of 4 millirem/year:

    2042RADIONUCLIDE

    2043CRITICAL ORGAN

    2045pCi/L

    2046Tritium

    2047total body

    204920,000

    2051Strontium90

    2052bone marrow

    20548

    2055pCi/L = picoCuries per liter

    20603. If two or more radionuclides are present, the sum of their annual dose equivalent to the total body or to any organ shall not exceed 4 millirem/year.

    2088(c) For the purposes of monitoring for gross alpha particle activity, radium-226, radium-228, uranium, and beta particle and photon radioactivity in drinking water, the following regulatory detection limits shall be used:

    2119CONTAMINANT

    2120REGULATORY DETECTION LIMIT

    2123Gross alpha particle activity

    21273 pCi/L

    2129Radium-226

    21301 pCi/L

    2132Radium-228

    21331 pCi/L

    2135Uranium

    21361 ug/L

    2138Tritium

    21391,000 pCi/L

    2142Strontium-89

    214310 pCi/L

    2145Strontium-90

    21462 pCi/L

    2148Iodine-131

    21491 pCi/L

    2151Cesium-134

    215210 pCi/L

    2154Gross beta

    21564 pCi/L

    2158Other radionuclides

    21601/10 of the applicable limit

    2165pCi/L = picoCuries per liter

    2170ug/L = micrograms per liter

    2175Rulemaking Authority 2177403.8055, 2178403.861(9) FS. 2180Law Implemented 2182403.852(12), 2183403.853(1) FS. 2185History–New 11-19-87, Formerly 17-22.210, Amended 1-18-89, 5-7-90, 1-3-91, 1-1-93, 1-26-93, 7-4-93, Formerly 17-550.310, Amended 9-7-94, 8-1-00, 11-27-01, 4-14-03, 4-25-03, 11-28-04, 12-30-11, 6-24-14, 7-7-15.

     

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