ADMINISTRATIVE CODE

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  3. TITLE 35: ENVIRONMENTAL PROTECTION
  4. CHAPTER I: POLLUTION CONTROL BOARD
TITLE 35: ENVIRONMENTAL PROTECTION
SUBTITLE F: PUBLIC WATER SUPPLIES
CHAPTER I: POLLUTION CONTROL BOARD
PART 611 PRIMARY DRINKING WATER STANDARDS
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SUBPART A: GENERAL

Section 611.100 Purpose, Scope, and Applicability
Section 611.101 Definitions
Section 611.102 Incorporations by Reference
Section 611.103 Severability
Section 611.105 Electronic Reporting
Section 611.107 Agency Inspection of PWS Facilities (Repealed)
Section 611.108 Delegation to Local Government
Section 611.109 Enforcement
Section 611.110 Special Exception Permits
Section 611.111 Relief Equivalent to SDWA Section 1415(a) Variances
Section 611.112 Relief Equivalent to SDWA Section 1416 Exemptions
Section 611.113 Alternative Treatment Techniques
Section 611.114 Siting Requirements
Section 611.115 Source Water Quantity (Repealed)
Section 611.120 Effective Dates (Repealed)
Section 611.121 Maximum Contaminant Levels
Section 611.125 Fluoridation Requirement
Section 611.126 Using Lead-Free Pipes, Fittings, Fixtures, Solder, and Flux for Drinking Water
Section 611.130 Special Requirements for Certain Variances and Adjusted Standards
Section 611.131 Relief Equivalent to SDWA Section 1415(e) Small System Variance
Section 611.160 Composite Correction Program
Section 611.161 Case-by-Case Reduced Subpart Y Monitoring for Wholesale and Consecutive Systems

SUBPART B: FILTRATION AND DISINFECTION

Section 611.201 Requiring a Demonstration
Section 611.202 Procedures for Agency Determinations (Repealed)
Section 611.211 Filtration Required
Section 611.212 Groundwater under Direct Influence of Surface Water
Section 611.213 No Method of HPC Analysis
Section 611.220 General Requirements
Section 611.230 Filtration Effective Dates (Repealed)
Section 611.231 Source Water Limitation
Section 611.232 Site-Specific Conditions (Repealed)
Section 611.233 Treatment Technique Violations
Section 611.240 Disinfection
Section 611.241 Unfiltered PWSs (Repealed)
Section 611.242 Filtered PWSs
Section 611.250 Filtration
Section 611.261 Unfiltered PWSs: Reporting and Recordkeeping
Section 611.262 Filtered PWSs: Reporting and Recordkeeping
Section 611.271 Protection during Repair Work (Repealed)
Section 611.272 Disinfection Following Repair (Repealed)
Section 611.276 Recycle Provisions

SUBPART C: USE OF NON-CENTRALIZED TREATMENT DEVICES

Section 611.280 Point-of-Entry Devices
Section 611.290 Point-of-Use Devices or Bottled Water

SUBPART D: TREATMENT TECHNIQUES

Section 611.295 General Requirements
Section 611.296 Acrylamide and Epichlorohydrin
Section 611.297 Corrosion Control (Repealed)

SUBPART F: MAXIMUM CONTAMINANT LEVELS (MCLs) AND MAXIMUM RESIDUAL DISINFECTANT LEVELS (MRDLs)

Section 611.300 State-Only MCLs for Inorganic Chemical Contaminants
Section 611.301 Revised MCLs for Inorganic Chemical Contaminants
Section 611.310 State-Only Maximum Contaminant Levels (MCLs) for Organic Chemical Contaminants
Section 611.311 Revised MCLs for Organic Chemical Contaminants
Section 611.312 Maximum Contaminant Levels (MCLs) for Disinfection Byproducts (DBPs)
Section 611.313 Maximum Residual Disinfectant Levels (MRDLs)
Section 611.320 Turbidity (Repealed)
Section 611.325 Microbiological Contaminants
Section 611.330 Maximum Contaminant Levels for Radionuclides
Section 611.331 Beta Particle and Photon Radioactivity (Repealed)

SUBPART G: LEAD AND COPPER

Section 611.350 General Requirements
Section 611.351 Applicability of Corrosion Control
Section 611.352 Corrosion Control Treatment
Section 611.353 Source Water Treatment
Section 611.354 Lead Service Line Inventory and Replacing Lead Service Lines
Section 611.355 Public Education and Supplemental Monitoring and Mitigation
Section 611.356 Tap Water Monitoring for Lead and Copper
Section 611.357 Monitoring for Water Quality Parameters
Section 611.358 Monitoring for Lead and Copper in Source Water
Section 611.359 Analytical Methods
Section 611.360 Reporting
Section 611.361 Recordkeeping
Section 611.362 Monitoring for Lead in Schools and Child Care Facilities
Section 611.363 Small Supplier Compliance Flexibility

SUBPART I: DISINFECTANT RESIDUALS, DISINFECTION BYPRODUCTS, AND DISINFECTION BYPRODUCT PRECURSORS

Section 611.380 General Requirements
Section 611.381 Analytical Requirements
Section 611.382 Monitoring Requirements
Section 611.383 Compliance Requirements
Section 611.384 Reporting and Recordkeeping Requirements
Section 611.385 Treatment Technique for Control of Disinfection Byproduct (DBP) Precursors

SUBPART K: GENERAL MONITORING AND ANALYTICAL REQUIREMENTS

Section 611.480 Alternative Analytical Techniques
Section 611.490 Certified Laboratories
Section 611.491 Laboratory Testing Equipment (Repealed)
Section 611.500 Consecutive PWSs
Section 611.510 Special Monitoring for Unregulated Contaminants (Repealed)

SUBPART L: MICROBIOLOGICAL MONITORING AND ANALYTICAL REQUIREMENTS

Section 611.521 Routine Coliform Monitoring (Repealed)
Section 611.522 Repeat Coliform Monitoring (Repealed)
Section 611.523 Invalidation of Total Coliform Samples (Repealed)
Section 611.524 Sanitary Surveys (Repealed)
Section 611.525 Fecal Coliform and E. Coli Testing (Repealed)
Section 611.526 Analytical Methodology (Repealed)
Section 611.527 Response to Violation (Repealed)
Section 611.528 Transition from Subpart L to Subpart AA Requirements (Repealed)
Section 611.531 Analytical Requirements
Section 611.532 Unfiltered PWSs
Section 611.533 Filtered PWSs

SUBPART M: TURBIDITY MONITORING AND ANALYTICAL REQUIREMENTS

Section 611.560 Turbidity (Repealed)

SUBPART N: INORGANIC MONITORING AND ANALYTICAL REQUIREMENTS

Section 611.591 Violation of a State-Only MCL
Section 611.592 Frequency of State Monitoring
Section 611.600 Applicability
Section 611.601 Monitoring Frequency
Section 611.602 Asbestos Monitoring Frequency
Section 611.603 Inorganic Monitoring Frequency
Section 611.604 Nitrate Monitoring
Section 611.605 Nitrite Monitoring
Section 611.606 Confirmation Samples
Section 611.607 More Frequent Monitoring and Confirmation Sampling
Section 611.608 Additional Optional Monitoring
Section 611.609 Determining Compliance
Section 611.610 Inorganic Monitoring Times
Section 611.611 Inorganic Analysis
Section 611.612 Monitoring Requirements for Old Inorganic MCLs
Section 611.630 Special Monitoring for Sodium
Section 611.631 Special Monitoring for Inorganic Chemicals (Repealed)

SUBPART O: ORGANIC MONITORING AND ANALYTICAL REQUIREMENTS

Section 611.640 Definitions
Section 611.641 State-Only MCLs
Section 611.645 Analytical Methods for Organic Chemical Contaminants
Section 611.646 Phase I, Phase II, and Phase V Volatile Organic Contaminants
Section 611.647 Sampling for Phase I Volatile Organic Contaminants (Repealed)
Section 611.648 Phase II, Phase IIB, and Phase V Synthetic Organic Contaminants
Section 611.650 Monitoring for 36 Contaminants (Repealed)
Section 611.657 Analytical Methods for 36 Contaminants (Repealed)
Section 611.658 Special Monitoring for Organic Chemicals (Repealed)

SUBPART P: THM MONITORING AND ANALYTICAL REQUIREMENTS

Section 611.680 Sampling, Analytical, and other Requirements (Repealed)
Section 611.683 Reduced Monitoring Frequency (Repealed)
Section 611.684 Averaging (Repealed)
Section 611.685 Analytical Methods (Repealed)
Section 611.686 Modification to System (Repealed)
Section 611.687 Sampling for Maximum THM Potential (Repealed)
Section 611.688 Applicability Dates (Repealed)

SUBPART Q: RADIOLOGICAL MONITORING AND ANALYTICAL REQUIREMENTS

Section 611.720 Analytical Methods
Section 611.731 Gross Alpha
Section 611.732 Beta Particle and Photon Radioactivity
Section 611.733 General Monitoring and Compliance Requirements

SUBPART R: ENHANCED FILTRATION AND DISINFECTION: SYSTEMS THAT SERVE 10,000 OR MORE PEOPLE

Section 611.740 General Requirements
Section 611.741 Standards for Filtration
Section 611.742 Disinfection Profiling and Benchmarking
Section 611.743 Filtration
Section 611.744 Filtration Sampling Requirements
Section 611.745 Reporting and Recordkeeping Requirements

SUBPART S: GROUNDWATER RULE

Section 611.800 General Requirements and Applicability
Section 611.801 Sanitary Surveys for GWS Suppliers
Section 611.802 Groundwater Source Microbial Monitoring and Analytical Methods
Section 611.803 Treatment Technique Requirements for GWS Suppliers
Section 611.804 Treatment Technique Violations for GWS Suppliers
Section 611.805 Reporting and Recordkeeping for GWS Suppliers

SUBPART T: REPORTING AND RECORDKEEPING

Section 611.830 Applicability
Section 611.831 Monthly Operating Report (Repealed)
Section 611.832 Notice by Agency (Repealed)
Section 611.833 Cross Connection Reporting (Repealed)
Section 611.840 Reporting
Section 611.851 Reporting MCL, MRDL, and other Violations (Repealed)
Section 611.852 Reporting other Violations (Repealed)
Section 611.853 Notice to New Billing Units (Repealed)
Section 611.854 General Content of Public Notice (Repealed)
Section 611.855 Mandatory Health Effects Language (Repealed)
Section 611.856 Fluoride Notice (Repealed)
Section 611.858 Fluoride Secondary Standard (Repealed)
Section 611.860 Record Maintenance
Section 611.870 List of 36 Contaminants (Repealed)

SUBPART U: CONSUMER CONFIDENCE REPORTS

Section 611.881 Purpose and Applicability
Section 611.882 Compliance Dates
Section 611.883 Content of the Reports
Section 611.884 Required Additional Health Information
Section 611.885 Report Delivery and Recordkeeping

SUBPART V: PUBLIC NOTIFICATION OF DRINKING WATER VIOLATIONS

Section 611.901 General Public Notification Requirements
Section 611.902 Tier 1 Public Notice: Form, Manner, and Frequency of Notice
Section 611.903 Tier 2 Public Notice: Form, Manner, and Frequency of Notice
Section 611.904 Tier 3 Public Notice: Form, Manner, and Frequency of Notice
Section 611.905 Content of the Public Notice
Section 611.906 Notice to New Billing Units or New Customers
Section 611.907 Special Notice of the Availability of Unregulated Contaminant Monitoring Results
Section 611.908 Special Notice for Exceedance of the Fluoride Secondary Standard
Section 611.909 Special Notice for Nitrate Exceedances above the MCL by a Non-Community Water System
Section 611.910 Notice by the Agency on Behalf of a PWS
Section 611.911 Special Notice for Cryptosporidium

SUBPART W: INITIAL DISTRIBUTION SYSTEM EVALUATIONS

Section 611.920 General Requirements
Section 611.921 Standard Monitoring
Section 611.922 System-Specific Studies
Section 611.923 40/30 Certification
Section 611.924 Very Small System Waivers
Section 611.925 Subpart Y Compliance Monitoring Location Recommendations

SUBPART X: ENHANCED FILTRATION AND DISINFECTION – SYSTEMS SERVING FEWER THAN 10,000 PEOPLE

Section 611.950 General Requirements
Section 611.951 Finished Water Reservoirs
Section 611.952 Additional Watershed Control Requirements for Unfiltered Systems
Section 611.953 Disinfection Profile
Section 611.954 Disinfection Benchmark
Section 611.955 Combined Filter Effluent Turbidity Limits
Section 611.956 Individual Filter Turbidity Requirements
Section 611.957 Reporting and Recordkeeping Requirements

SUBPART Y: STAGE 2 DISINFECTION BYPRODUCTS REQUIREMENTS

Section 611.970 General Requirements
Section 611.971 Routine Monitoring
Section 611.972 Subpart Y Monitoring Plan
Section 611.973 Reduced Monitoring
Section 611.974 Additional Requirements for Consecutive Systems
Section 611.975 Conditions Requiring Increased Monitoring
Section 611.976 Operational Evaluation Levels
Section 611.977 Requirements for Remaining on Reduced TTHM and HAA5 Monitoring Based on Subpart I Results
Section 611.978 Requirements for Remaining on Increased TTHM and HAA5 Monitoring Based on Subpart I Results
Section 611.979 Reporting and Recordkeeping Requirements

SUBPART Z: ENHANCED TREATMENT FOR CRYPTOSPORIDIUM

Section 611.1000 General Requirements
Section 611.1001 Source Water Monitoring Requirements: Source Water Monitoring
Section 611.1002 Source Water Monitoring Requirements: Sampling Schedules
Section 611.1003 Source Water Monitoring Requirements: Sampling Locations
Section 611.1004 Source Water Monitoring Requirements: Analytical Methods
Section 611.1005 Source Water Monitoring Requirements: Approved Laboratories
Section 611.1006 Source Water Monitoring Requirements: Reporting Source Water Monitoring Results
Section 611.1007 Source Water Monitoring Requirements: Grandfathering Previously Collected Data
Section 611.1008 Disinfection Profiling and Benchmarking Requirements: Requirements When Making a Significant Change in Disinfection Practice
Section 611.1009 Disinfection Profiling and Benchmarking Requirements: Developing the Disinfection Profile and Benchmark
Section 611.1010 Treatment Technique Requirements: Bin Classification for Filtered System Suppliers
Section 611.1011 Treatment Technique Requirements: Filtered System Additional Cryptosporidium Treatment Requirements
Section 611.1012 Treatment Technique Requirements: Unfiltered System Cryptosporidium Treatment Requirements
Section 611.1013 Treatment Technique Requirements: Schedule for Compliance with Cryptosporidium Treatment Requirements
Section 611.1014 Treatment Technique Requirements: Requirements for Uncovered Finished Water Storage Facilities
Section 611.1015 Requirements for Microbial Toolbox Components: Microbial Toolbox Options for Meeting Cryptosporidium Treatment Requirements
Section 611.1016 Requirements for Microbial Toolbox Components: Source Toolbox Components
Section 611.1017 Requirements for Microbial Toolbox Components: Pre-Filtration Treatment Toolbox Components
Section 611.1018 Requirements for Microbial Toolbox Components: Treatment Performance Toolbox Components
Section 611.1019 Requirements for Microbial Toolbox Components: Additional Filtration Toolbox Components
Section 611.1020 Requirements for Microbial Toolbox Components: Inactivation Toolbox Components
Section 611.1021 Reporting and Recordkeeping Requirements: Reporting Requirements
Section 611.1022 Reporting and Recordkeeping Requirements: Recordkeeping Requirements
Section 611.1023 Requirements to Respond to Significant Deficiencies Identified in Sanitary Surveys Performed by USEPA or the Agency

SUBPART AA: REVISED TOTAL COLIFORM RULE

Section 611.1051 General
Section 611.1052 Analytical Methods and Laboratory Certification
Section 611.1053 General Monitoring Requirements for all PWSs
Section 611.1054 Routine Monitoring Requirements for Non-CWSs That Serve 1,000 or Fewer People Using Only Groundwater
Section 611.1055 Routine Monitoring Requirements for CWSs That Serve 1,000 or Fewer People Using Only Groundwater
Section 611.1056 Routine Monitoring Requirements for Subpart B Systems That Serve 1,000 or Fewer People
Section 611.1057 Routine Monitoring Requirements for PWSs That Serve More Than 1,000 People
Section 611.1058 Repeat Monitoring and E. coli Requirements
Section 611.1059 Coliform Treatment Technique Triggers and Assessment Requirements for Protection Against Potential Fecal Contamination
Section 611.1060 Violations
Section 611.1061 Reporting and Recordkeeping

SUBPART AG: INTERIM LEAD AND COPPER RULES

Section 611.1350 General Requirements
Section 611.1351 Applicability of Corrosion Control
Section 611.1352 Corrosion Control Treatment
Section 611.1353 Source Water Treatment
Section 611.1354 Lead Service Line Replacement
Section 611.1355 Public Education and Supplemental Monitoring
Section 611.1356 Tap Water Monitoring for Lead and Copper
Section 611.1357 Monitoring for Water Quality Parameters
Section 611.1358 Monitoring for Lead and Copper in Source Water
Section 611.1359 Analytical Methods
Section 611.1360 Reporting
Section 611.1361 Recordkeeping

Section 611.APPENDIX A Regulated Contaminants

Section 611.APPENDIX A Regulated Contaminants
Section 611.APPENDIX B Percent Inactivation of G. Lamblia Cysts
Section 611.APPENDIX C Common Names of Organic Chemicals
Section 611.APPENDIX D Defined Substrate Method for the Simultaneous Detection of Total Coliforms and Escherichia Coli from Drinking Water (Repealed)
Section 611.APPENDIX E Mandatory Lead Public Education Information for Community Water Systems
Section 611.APPENDIX F Mandatory Lead Public Education Information for Non-Transient Non-Community Water Systems
Section 611.APPENDIX G NPDWR Violations and Situations Requiring Public Notice
Section 611.APPENDIX H Standard Health Effects Language for Public Notification
Section 611.APPENDIX I Acronyms Used in Public Notification Regulation
Section 611.TABLE A Total Coliform Monitoring Frequency (Repealed)
Section 611.TABLE B Fecal or Total Coliform Density Measurements
Section 611.TABLE C Frequency of RDC Measurement
Section 611.TABLE D Number of Lead and Copper Monitoring Sites
Section 611.TABLE E Lead and Copper Monitoring Start Dates (Repealed)
Section 611.TABLE F Number of Water Quality Parameter Sampling Sites
Section 611.TABLE G Summary of Section 611.357 Monitoring Requirements for Water Quality Parameters (Repealed)
Section 611.TABLE H CT Values (mg·min/l) for Cryptosporidium Inactivation by Chlorine Dioxide
Section 611.TABLE I CT Values (mg·min/l) for Cryptosporidium Inactivation by Ozone
Section 611.TABLE J UV Dose Table for Cryptosporidium, Giardia lamblia, and Virus Inactivation Credit
Section 611.TABLE R Radionuclide Conversion Factors
Section 611.TABLE Z Federal Effective Dates
AUTHORITY: Implementing Sections 7.2, 17, and 17.5 and authorized by Section 27 of the Environmental Protection Act [415 ILCS 5/7.2, 17, 17.5, and 27].
SOURCE: Adopted in R88-26 at 14 Ill. Reg. 16517, effective September 20, 1990; amended in R90-21 at 14 Ill. Reg. 20448, effective December 11, 1990; amended in R90-13 at 15 Ill. Reg. 1562, effective January 22, 1991; amended in R91-3 at 16 Ill. Reg. 19010, effective December 1, 1992; amended in R92-3 at 17 Ill. Reg. 7796, effective May 18, 1993; amended in R93-1 at 17 Ill. Reg. 12650, effective July 23, 1993; amended in R94-4 at 18 Ill. Reg. 12291, effective July 28, 1994; amended in R94-23 at 19 Ill. Reg. 8613, effective June 20, 1995; amended in R95-17 at 20 Ill. Reg. 14493, effective October 22, 1996; amended in R98-2 at 22 Ill. Reg. 5020, effective March 5, 1998; amended in R99-6 at 23 Ill. Reg. 2756, effective February 17, 1999; amended in R99-12 at 23 Ill. Reg. 10348, effective August 11, 1999; amended in R00-8 at 23 Ill. Reg. 14715, effective December 8, 1999; amended in R00-10 at 24 Ill. Reg. 14226, effective September 11, 2000; amended in R01-7 at 25 Ill. Reg. 1329, effective January 11, 2001; amended in R01-20 at 25 Ill. Reg. 13611, effective October 9, 2001; amended in R02-5 at 26 Ill. Reg. 3522, effective February 22, 2002; amended in R03-4 at 27 Ill. Reg. 1183, effective January 10, 2003; amended in R03-15 at 27 Ill. Reg. 16447, effective October 10, 2003; amended in R04-3 at 28 Ill. Reg. 5269, effective March 10, 2004; amended in R04-13 at 28 Ill. Reg. 12666, effective August 26, 2004; amended in R05-6 at 29 Ill. Reg. 2287, effective January 28, 2005; amended in R06-15 at 30 Ill. Reg. 17004, effective October 13, 2006; amended in R07-2/R07-11 at 31 Ill. Reg. 11757, effective July 27, 2007; amended in R08-7/R08-13 at 33 Ill. Reg. 633, effective December 30, 2008; amended in R10-1/R10-17/R11-6 at 34 Ill. Reg. 19848, effective December 7, 2010; amended in R12-4 at 36 Ill. Reg. 7110, effective April 25, 2012; amended in R13-2 at 37 Ill. Reg. 1978, effective February 4, 2013; amended in R14-8 at 38 Ill. Reg. 3608, effective January 27, 2014; amended in R14-9 at 38 Ill. Reg. 9792, effective April 21, 2014; amended in R15-6 at 39 Ill. Reg. 3713, effective February 24, 2015; amended in R15-23 at 39 Ill. Reg. 15144, effective November 9, 2015; amended in R16-4 at 39 Ill. Reg. 15352, effective November 13, 2015; amended in R17-12 at 42 Ill. Reg. 1140, effective January 4, 2018; amended in R18-9 at 42 Ill. Reg. 9316, effective May 29, 2018; amended in R18-17 at 43 Ill. Reg. 8206, effective July 26, 2019; amended in R19-16 at 44 Ill. Reg. 6996, effective April 17, 2020; amended in R18-26 at 47 Ill. Reg. 7556, effective May 16, 2023; amended in R21-10/R22-2 at 47 Ill. Reg. 16486, effective November 2, 2023; amended in R23-9 at 47 Ill. Reg. 18996, effective December 7, 2023.