Part 611: PRIMARY DRINKING WATER STANDARDS

Section 611.1002 Source Water Monitoring Requirements: Sampling Schedules a) A supplier required to conduct source water monitoring under Section 611.1001 must submit a sampling schedule that specifies the calendar dates on which it will collect each required sample. 1) The suppl…

Section 611.1003 Source Water Monitoring Requirements: Sampling Locations a) A supplier required to conduct source water monitoring under Section 611.1001 must collect samples for each plant that treats a surface water or groundwater under the direct influence of surface water so…

Section 611.1004 Source Water Monitoring Requirements: Analytical Methods a) Cryptosporidium. A supplier must analyze for Cryptosporidium using USEPA 1623 (05), USEPA 1623.1 (12), or USEPA 1622 (05), each incorporated by reference in Section 611.102, or alternative methods approv…

Section 611.1005 Source Water Monitoring Requirements: Approved Laboratories a) Cryptosporidium. A supplier must have Cryptosporidium samples analyzed by a laboratory that is approved under USEPA's Laboratory Quality Assurance Evaluation Program for Analysis of Cryptosporidium in…

Section 611.1006 Source Water Monitoring Requirements: Reporting Source Water Monitoring Results a) A supplier must report results from the source water monitoring required under Section 611.1001 no later than ten days after the end of the first month following the month when the…

Section 611.1007 Source Water Monitoring Requirements: Grandfathering Previously Collected Data a) Initial Source Monitoring and Cryptosporidium Samples 1) A supplier may comply with the initial source water monitoring requirements of Section 611.1001(a) by grandfathering sample …

Section 611.1008 Disinfection Profiling and Benchmarking Requirements: Requirements When Making a Significant Change in Disinfection Practice a) Following the completion of initial source water monitoring under Section 611.1001(a), a supplier that plans to make a significant chan…

Section 611.1009 Disinfection Profiling and Benchmarking Requirements: Developing the Disinfection Profile and Benchmark a) A supplier required to develop disinfection profiles under Section 611.1008 must follow the requirements of this Section. The supplier must monitor at least…

Section 611.101 Definitions The terms this Section defines have the given meanings in this Part: "Act" means the Environmental Protection Act [415 ILCS 5]. "Agency" means the Illinois Environmental Protection Agency. BOARD NOTE: The Department of Public Health (Public Health or D…

Section 611.1010 Treatment Technique Requirements: Bin Classification for Filtered System Suppliers a) Following completion of the initial round of source water monitoring required under Section 611.1001(a), a filtered system supplier must calculate an initial Cryptosporidium bin…

Section 611.1011 Treatment Technique Requirements: Filtered System Additional Cryptosporidium Treatment Requirements a) A filtered system supplier must provide the level of additional treatment for Cryptosporidium specified in subsections (a)(1) through (a)(4) based on its bin cl…

Section 611.1012 Treatment Technique Requirements: Unfiltered System Cryptosporidium Treatment Requirements a) Determination of the Mean Cryptosporidium Level 1) Following completion of the initial source water monitoring required by Section 611.1001(a), an unfiltered system supp…

Section 611.1013 Treatment Technique Requirements: Schedule for Compliance with Cryptosporidium Treatment Requirements a) Following initial bin classification under Section 611.1010(c), a filtered system supplier must provide the level of treatment for Cryptosporidium required by…

Section 611.1014 Treatment Technique Requirements: Requirements for Uncovered Finished Water Storage Facilities a) A supplier that uses uncovered finished water storage facilities must comply with the conditions of this Section. b) A supplier must notify the Agency in writing of …

Section 611.1015 Requirements for Microbial Toolbox Components: Microbial Toolbox Options for Meeting Cryptosporidium Treatment Requirements a) Treatment Credits 1) A supplier receives the applicable of the treatment credits in subsection (b) by meeting the conditions for microbi…

Section 611.1016 Requirements for Microbial Toolbox Components: Source Toolbox Components a) Watershed Control Program. A supplier receives 0.5-log Cryptosporidium treatment credit for implementing a watershed control program that meets the requirements of this Section. 1) A supp…

Section 611.1017 Requirements for Microbial Toolbox Components: Pre-Filtration Treatment Toolbox Components a) Presedimentation. A supplier receives 0.5-log Cryptosporidium treatment credit for a presedimentation basin during any month the process meets the criteria in this subse…

Section 611.1018 Requirements for Microbial Toolbox Components: Treatment Performance Toolbox Components a) Combined Filter Performance. A supplier that uses conventional filtration treatment or direct filtration treatment receives an additional 0.5-log Cryptosporidium treatment …

Section 611.1019 Requirements for Microbial Toolbox Components: Additional Filtration Toolbox Components a) Bag and Cartridge Filters. A supplier receives Cryptosporidium treatment credit of up to 2.0-log for individual bag or cartridge filters and up to 2.5-log for bag or cartri…

Section 611.102 Incorporations by Reference a) Analytical Methods. The Board incorporates by reference the following analytical methods. The rules refer to the methods by the defined short-form names given them in this Section. "AMI Turbiwell (09)" means "Continuous Measurement o…

Section 611.1020 Requirements for Microbial Toolbox Components: Inactivation Toolbox Components a) Calculation of CT Values 1) CT is the product of the disinfectant contact time (T, in minutes) and disinfectant concentration (C, in milligrams per liter). A supplier with treatment…

Section 611.1021 Reporting and Recordkeeping Requirements: Reporting Requirements a) A supplier must report sampling schedules under Section 611.1002 and source water monitoring results under Section 611.1006 unless it notifies the Agency that it will not conduct source water mon…

Section 611.1022 Reporting and Recordkeeping Requirements: Recordkeeping Requirements a) A supplier must keep results from the initial round of source water monitoring pursuant to Section 611.1001(a) and the second round of source water monitoring pursuant to Section 611.1001(b) …

Section 611.1023 Requirements to Respond to Significant Deficiencies Identified in Sanitary Surveys Performed by USEPA or the Agency a) A "sanitary survey" is an onsite review of the water source (identifying sources of contamination by using results of source water assessments i…

Section 611.103 Severability If a court of competent jurisdiction adjudges any provision of this Part invalid or determines applying it to any person or in any circumstance invalid, the invalidity of the provision does not affect the validity of this Part as a whole or any Subpar…

Section 611.105 Electronic Reporting Submitting any document to comply with this Part as an electronic document in lieu of a paper document must comply with this Section. a) Scope and Applicability 1) The USEPA, the Board, or the Agency may provide for submitting electronic docum…

Section 611.1051 General a) General. The provisions of this Subpart AA include both MCL and treatment technique requirements. b) Applicability. The provisions of this Subpart AA apply to all PWSs. c) This subsection (c) corresponds with 40 CFR 141.851(c), which includes a past co…

Section 611.1052 Analytical Methods and Laboratory Certification a) Analytical Methodology 1) The standard sample volume required for analysis is 100 mL, regardless of analytical method the supplier uses. 2) A supplier needs only determine the presence or absence of total colifor…

Section 611.1053 General Monitoring Requirements for all PWSs a) Sample Siting Plans 1) A supplier must develop a written sample siting plan that identifies sampling sites and a sample collection schedule that are representative of water throughout the distribution system. These …

Section 611.1054 Routine Monitoring Requirements for Non-CWSs That Serve 1,000 or Fewer People Using Only Groundwater a) General 1) This Section applies to non-CWS suppliers that use only groundwater (except groundwater under the direct influence of surface water, as defined in S…

Section 611.1055 Routine Monitoring Requirements for CWSs That Serve 1,000 or Fewer People Using Only Groundwater a) General 1) This Section applies to CWS suppliers that use only ground water (except ground water under the direct influence of surface water, as defined in Section…

Section 611.1056 Routine Monitoring Requirements for Subpart B Systems That Serve 1,000 or Fewer People a) General 1) The provisions of this Section apply to a Subpart B system supplier that serves 1,000 or fewer people. 2) Following any total coliform-positive sample taken under…

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 th…

Section 611.1058 Repeat Monitoring and E. coli Requirements a) Repeat Monitoring 1) If a sample taken under Sections 611.1054 through 611.1057 is total coliform-positive, the supplier must collect a set of repeat samples within 24 hours after being notified of the positive result…

Section 611.1059 Coliform Treatment Technique Triggers and Assessment Requirements for Protection Against Potential Fecal Contamination a) Treatment Technique Triggers. A supplier must conduct assessments in compliance with subsection (b) after exceeding treatment technique trigg…

Section 611.1060 Violations a) E. coli MCL Violations. A supplier is in violation of the MCL for E. coli when any of the conditions identified in subsections (a)(1) through (a)(4) occur. 1) The supplier has an E. coli-positive repeat sample following a total coliform-positive rou…

Section 611.1061 Reporting and Recordkeeping a) Reporting 1) E. coli A) A supplier must notify the Agency by the end of the day when the system learns of an E. coli MCL violation, unless the supplier learns of the violation after the Agency office is closed and the Agency does no…

Section 611.107 Agency Inspection of PWS Facilities (Repealed) (Source: Repealed at 43 Ill. Reg. 8206, effective July 26, 2019)

Section 611.108 Delegation to Local Government The Agency may delegate portions of its inspection, investigating, and enforcement functions to units of local government under Section 4(r) of the Act. (Source: Amended at 47 Ill. Reg. 16486, effective November 2, 2023)

Section 611.109 Enforcement a) Any person may file an enforcement action under Title VIII of the Act. b) A complainant may use the results of monitoring this Part requires in an enforcement action. BOARD NOTE: This Section derives from 40 CFR 141.22(e)and 141.23(a)(4). (Source: A…

Section 611.110 Special Exception Permits a) The Agency must evaluate a request for a SEP granting relief from monitoring requirements of Section 611.601, 611.602, or 611.603 (IOCs, excluding the Section 611.603 monitoring frequency requirements for cyanide); Section 611.646(f) (…

Section 611.111 Relief Equivalent to SDWA Section 1415(a) Variances This Section describes how the Board grants relief equivalent to that available from USEPA under section 1415(a)(1)(A) and (a)(1)(B) of SDWA (42 U.S.C. 300g-4(a)(1)(A) and (a)(1)(B)). Every variance under Section…

Section 611.112 Relief Equivalent to SDWA Section 1416 Exemptions This Section describes how the Board grants relief equivalent to that available from USEPA under section 1416 of the SDWA (42 U.S.C. 300g-5). Every variance under Sections 35 through 37 of the Act must require the …

Section 611.113 Alternative Treatment Techniques This Section is equivalent to section 1415(a)(3) of SDWA (42 U.S.C. 300g-4(a)(3)). a) The Board will grant any adjusted standard from a treatment technique requirement under this Section. b) The supplier seeking an adjusted standar…

Section 611.114 Siting Requirements Before entering into a financial commitment for or beginning to construct a new PWS or increasing the capacity of an existing PWS, a supplier must obtain a construction permit under 35 Ill. Adm. Code 602.101 and, to the extent practicable, avoi…

Section 611.115 Source Water Quantity (Repealed) (Source: Repealed at 43 Ill. Reg. 8206, effective July 26, 2019)

Section 611.120 Effective Dates (Repealed) (Source: Repealed at 47 Ill. Reg. 16486, effective November 2, 2023)