Part 611: PRIMARY DRINKING WATER STANDARDS

Section 611.130 Special Requirements for Certain Variances and Adjusted Standards a) Relief from the Fluoride MCL 1) When granting any variance or adjusted standard to a CWS supplier from the maximum contaminant level for fluoride in Section 611.301(b), the Board will require the…

Section 611.131 Relief Equivalent to SDWA Section 1415(e) Small System Variance This Section is the State equivalent of SDWA section 1415(e) (42 U.S.C. 300g-4(e)). a) A PWS serving fewer than 10,000 persons may obtain a variance from an MCL or treatment technique under this Secti…

Section 611.1350 General Requirements a) Applicability and Scope 1) Applicability and Complying with this Subpart AG. Subpart G and this Subpart AG constitute NPDWRs for lead and copper. Subpart G and this Subpart AG apply to all community water systems (CWSs) and non-transient, …

Section 611.1351 Applicability of Corrosion Control a) Corrosion Control Required. A supplier must complete the applicable corrosion control treatment under Section 611.1352 by the deadlines in this Section. 1) Large Systems. Each large system supplier (one regularly serving more…

Section 611.1352 Corrosion Control Treatment Each supplier must complete the corrosion control treatment requirements this Section describes that applying to the supplier under Section 611.1351. a) System Recommendation Regarding Corrosion Control Treatment 1) Based on the result…

Section 611.1353 Source Water Treatment A supplier must complete source water monitoring and treatment requirements (under subsection (b) and Sections 611.1356 and 611.1358) before specific deadlines. a) Deadlines for Completing Source Water Treatment Steps 1) Step 1: A supplier …

Section 611.1354 Lead Service Line Replacement a) Suppliers That Must Replace Lead Service Lines 1) If the results from tap samples the supplier took under Section 611.1356(d)(2) exceed the lead action level after the supplier installs corrosion control or source water treatment …

Section 611.1355 Public Education and Supplemental Monitoring A supplier exceeding the lead action level based on tap water samples under Section 611.1356 must deliver the public education materials subsection (a) requires under subsection (b). A supplier exceeding the lead actio…

Section 611.1356 Tap Water Monitoring for Lead and Copper a) Sampling Site Location 1) Selecting a Pool of Targeted Sampling Sites A) Before the applicable date for beginning monitoring under subsection (d)(1), a supplier must complete evaluating the materials in its distribution…

Section 611.1357 Monitoring for Water Quality Parameters A large system supplier or any small or medium-sized system supplier exceeding the lead or copper action level must monitor water quality parameters in addition to lead and copper under this Section. a) General Requirements…

Section 611.1358 Monitoring for Lead and Copper in Source Water a) Sampling Location, Collection Methods, and Number of Samples 1) A supplier failing to meet the lead or copper action level on the basis of tap samples under Section 611.1356 must collect lead and copper source wat…

Section 611.1359 Analytical Methods The supplier must conduct analyses for lead, copper, pH, conductivity, calcium, alkalinity, orthophosphate, silica, and temperature using the methods in Section 611.611(a). a) Only a certified laboratory in one of the categories in Section 611.…

Section 611.1360 Reporting A supplier must report specific information to the Agency as this Section provides. a) Reporting for Tap, Lead, and Copper, and Water Quality Parameter Monitoring 1) Except as subsection (a)(1)(H) provides otherwise, a supplier must report certain infor…

Section 611.1361 Recordkeeping Any supplier subject to this Subpart AG must keep original records of all sampling data and analyses, reports, surveys, letters, evaluations, schedules, Agency determinations, and any other information Sections 611.1351 through Section 611.1360 requ…

Section 611.160 Composite Correction Program a) The Agency may issue a SEP requiring a PWS to conduct a Composite Correction Program (CCP). The CCP must consist of two elements: a Comprehensive Performance Evaluation (CPE) and a Comprehensive Technical Assistance (CTA). 1) A CPE …

Section 611.161 Case-by-Case Reduced Subpart Y Monitoring for Wholesale and Consecutive Systems The Agency may issue a SEP reducing monitoring under Subpart Y as they apply to a wholesale system or a consecutive system, otherwise than as Section 611.500 provides, subject to limit…

Section 611.201 Requiring a Demonstration The Agency must issue a SEP notifying a supplier when the Agency requires the supplier to make demonstrations under this Subpart B. The Agency must require demonstrations when USEPA requires the type of demonstration, allowing sufficient …

Section 611.202 Procedures for Agency Determinations (Repealed) (Source: Repealed at 47 Ill. Reg. 16486, effective November 2, 2023)

Section 611.211 Filtration Required The Agency must require a supplier using a surface water source or groundwater under the direct influence of surface water to filter the water it provides to the public. BOARD NOTE: This Section originally derived from 40 CFR 141.71 and the pre…

Section 611.212 Groundwater under Direct Influence of Surface Water The Agency must require a CWS supplier to demonstrate under Section 611.201 whether it uses "groundwater under the direct influence of surface water". Based on the information the supplier provides, the Agency mu…

Section 611.213 No Method of HPC Analysis Sections 611.241(d)(2), 611.242(c)(2), 611.261(b)(8)(G), 611.262(b)(3)(G), 611.532(f)(2), and 611.533(c)(2) rely on this Section. The Agency must determine that a system has no means for having a sample analyzed for HPC based on specific …

Section 611.220 General Requirements a) This Subpart B constitutes NPDWRs. This Subpart B establishes criteria for filtration as a treatment technique for PWSs using a surface water source or groundwater source under the direct influence of surface water. This Subpart B also esta…

Section 611.230 Filtration Effective Dates (Repealed) (Source: Repealed at 47 Ill. Reg. 16486, effective November 2, 2023)

Section 611.231 Source Water Limitation No CWS may use recycled sewage treatment plant effluent on a routine basis. BOARD NOTE: This is an additional State requirement. (Source: Amended at 47 Ill. Reg. 16486, effective November 2, 2023)

Section 611.232 Site-Specific Conditions (Repealed) (Source: Repealed at 47 Ill. Reg. 16486, effective November 2, 2023)

Section 611.233 Treatment Technique Violations A supplier violates a treatment technique requirement if not applying required filtration when the Agency requires in a SEP. (Source: Amended at 47 Ill. Reg. 16486, effective November 2, 2023)

Section 611.2350 General Requirements a) Applicability and Scope 1) Applicability of and Compliance with this Subpart AH. This Subpart G, Subpart AG, and Subpart AH constitute NPDWRs for lead and copper. This Subpart G, Subpart AG, and Subpart AH apply to all community water syst…

Section 611.2351 Applicability of Corrosion Control a) Corrosion Control Treatment. This Section provides when a supplier must complete the corrosion control treatment steps in subsection (d) or (e) to optimize or re-optimize corrosion control treatment based on size, whether the…

Section 611.2352 Corrosion Control Treatment Designating Optimal Corrosion Control Treatment for Systems Optimizing or Re-Optimizing Corrosion Control Treatment. A supplier must complete the corrosion control treatment requirements in this Section as they apply to the supplier un…

Section 611.2353 Source Water Treatment A supplier must complete source water monitoring and treatment requirements (under subsection (b) and Sections 611.2356 and 611.2358) before specific deadlines. a) Deadlines for Completing Source Water Treatment Steps 1) Step 1: A supplier …

Section 611.2354 Lead Service Line Inventory and Replacing Lead Service Lines a) Lead Service Line Inventory. A supplier must develop an inventory identifying the materials composition for all service lines connected to its distribution system. The inventory must meet specific re…

Section 611.2355 Public Education and Supplemental Monitoring and Mitigation A supplier exceeding the lead action level based on tap water samples under Section 611.2356 must deliver the public education materials subsection (a) requires under subsection (b). A supplier exceeding…

Section 611.2356 Tap Water Monitoring for Lead and Copper a) Sampling Site Location 1) Selecting a Pool of Targeted Sampling Sites A) Before the applicable date for beginning monitoring under subsection (d)(1), a supplier must identify a pool of targeted sampling sites complying …

Section 611.2357 Monitoring for Water Quality Parameters A large supplier or any small or mid-sized supplier exceeding the lead or copper action level or a small or mid-sized supplier applying corrosion control treatment and exceeding the lead trigger level must monitor water qua…

Section 611.2358 Monitoring for Lead and Copper in Source Water a) Sampling Location, Collection Methods, and Number of Samples 1) A supplier failing to meet the lead or copper action level on the basis of tap samples under Section 611.2356 must collect lead and copper source wat…

Section 611.2359 Analytical Methods The supplier must conduct analyses for lead, copper, pH, alkalinity, orthophosphate, and silica, using the methods in Section 611.611(a). a) Only a certified laboratory in one of the categories in Section 611.490(a) may conduct analyses for lea…

Section 611.2360 Reporting A supplier must report specific information to the Agency as this Section provides. a) Reporting for Tap, Lead, and Copper, and Water Quality Parameter Monitoring 1) Notwithstanding Section 611.840(a) and except as subsection (a)(1)(H) provides otherwis…

Section 611.2361 Recordkeeping Any supplier subject to this Subpart G must retain original records of all sampling data and analyses, reports, surveys, letters, evaluations, schedules, Agency determinations, and any other information Sections 611.2351 through 611.2360, 611.2362, …

Section 611.2362 Monitoring for Lead in Schools and Childcare Facilities A CWS supplier must conduct directed public education and lead monitoring at those schools and childcare facilities it serves that were constructed prior to January 1, 2014. A supplier must sample for lead a…

Section 611.2363 Small Supplier Compliance Flexibility This section gives compliance flexibility options applying to a small CWS supplier serving 10,000 or fewer persons or an NTNCWS supplier. A CWS or NTNCWS supplier having corrosion control treatment in place must continue oper…

Section 611.240 Disinfection a) This subsection (a) corresponds with the first sentence of 40 CFR 141.72, pertaining to unfiltered system suppliers using a surface water source not providing filtration treatment. These no longer exist in Illinois. This statement maintains structu…

Section 611.241 Unfiltered PWSs (Repealed) (Source: Repealed at 47 Ill. Reg. 16486, effective November 2, 2023)

Section 611.242 Filtered PWSs Each supplier providing filtration treatment must provide disinfection treatment: a) The disinfection treatment must sufficiently ensure that the system's total treatment processes achieve at least 99.9 percent (3-log) inactivation or removal of Giar…

Section 611.250 Filtration A supplier using a surface water source or a groundwater source under the direct influence of surface water must provide both disinfection treatment, as Section 611.242 specifies, and filtration treatment complying with subsection (a), (b), (c), (d), or…

Section 611.261 Unfiltered PWSs: Reporting and Recordkeeping A supplier using a groundwater source under the direct influence of surface water not providing filtration treatment must report monthly to the Agency the information this Section specifies beginning six months after th…

Section 611.262 Filtered PWSs: Reporting and Recordkeeping A supplier using a surface water source or a groundwater source under the direct influence of surface water that provides filtration treatment must monthly report specific information to the Agency. a) The supplier must r…

Section 611.271 Protection during Repair Work (Repealed) (Source: Repealed at 43 Ill. Reg. 8206, effective July 26, 2019)