Part 611: PRIMARY DRINKING WATER STANDARDS

Section 611.800 General Requirements and Applicability a) Scope of This Subpart S. The requirements of this Subpart S constitute NPDWRs. b) Applicability. This Subpart S applies to all PWS suppliers that use groundwater, except that it does not apply to public water systems that …

Section 611.801 Sanitary Surveys for GWS Suppliers a) A GWS supplier must provide the Agency, at the Agency's request, any existing information that will enable the Agency to conduct a sanitary survey. b) For the purposes of this Subpart S, a "sanitary survey", as conducted by th…

Section 611.802 Groundwater Source Microbial Monitoring and Analytical Methods a) Triggered Source Water Monitoring 1) General Requirements. A GWS supplier must conduct triggered source water monitoring if the following conditions exist. A) The supplier does not provide at least …

Section 611.803 Treatment Technique Requirements for GWS Suppliers a) GWS Suppliers with Significant Deficiencies or Source Water Fecal Contamination 1) The treatment technique requirements of this Section must be met by GWS suppliers when a significant deficiency is identified o…

Section 611.804 Treatment Technique Violations for GWS Suppliers a) A GWS supplier with a significant deficiency is in violation of the treatment technique requirement if, within 120 days (or earlier if directed by the Agency by a SEP) after receiving written notice from the Agen…

Section 611.805 Reporting and Recordkeeping for GWS Suppliers a) Reporting. In addition to the requirements of Section 611.840, a GWS supplier regulated under this Subpart S must provide the following information to the Agency: 1) A GWS supplier conducting compliance monitoring u…

Section 611.830 Applicability Except as otherwise provided, this Subpart T applies to violations of both identical in substance regulations and those noted as additional State requirements. (Source: Amended at 27 Ill. Reg. 16447, effective October 10, 2003)

Section 611.831 Monthly Operating Report (Repealed) (Source: Repealed at 43 Ill. Reg. 8206, effective July 26, 2019)

Section 611.832 Notice by Agency (Repealed) (Source: Repealed at 25 Ill. Reg. 1329, effective January 11, 2001)

Section 611.833 Cross Connection Reporting (Repealed) (Source: Repealed at 43 Ill. Reg. 8206, effective July 26, 2019)

Section 611.840 Reporting a) Except when this Part specifies a shorter period, a supplier must report to the Agency the results of any test measurement or analysis this Part requires within the earlier of the following timeframes: 1) The ten days after the month when the supplier…

Section 611.851 Reporting MCL, MRDL, and other Violations (Repealed) (Source: Repealed at 25 Ill. Reg. 1329, effective January 11, 2001)

Section 611.852 Reporting other Violations (Repealed) (Source: Repealed at 25 Ill. Reg. 1329, effective January 11, 2001)

Section 611.853 Notice to New Billing Units (Repealed) (Source: Repealed at 25 Ill. Reg. 1329, effective January 11, 2001)

Section 611.854 General Content of Public Notice (Repealed) (Source: Repealed at 25 Ill. Reg. 1329, effective January 11, 2001)

Section 611.855 Mandatory Health Effects Language (Repealed) (Source: Repealed at 25 Ill. Reg. 1329, effective January 11, 2001)

Section 611.856 Fluoride Notice (Repealed) (Source: Repealed at 25 Ill. Reg. 1329, effective January 11, 2001)

Section 611.858 Fluoride Secondary Standard (Repealed) (Source: Repealed at 25 Ill. Reg. 1329, effective January 11, 2001)

Section 611.860 Record Maintenance A supplier must keep on its premises or at a convenient location near its premises the following records: a) Records of bacteriological analyses and turbidity analyses made under this Part must be kept for not less than five years. Records of ch…

Section 611.870 List of 36 Contaminants (Repealed) (Source: Repealed at 20 Ill. Reg. 14493, effective October 22, 1996) SUBPART U: CONSUMER CONFIDENCE REPORTS

Section 611.881 Purpose and Applicability a) This Subpart U establishes the minimum requirements for the content of reports that community water systems (CWSs) must deliver to their customers. These reports must contain information on the quality of the water delivered by the sys…

Section 611.882 Compliance Dates a) Between June 24, 2024 and December 31, 2026, CWS suppliers must comply with Sections 611.881 through 611.885 (except Section 611.883(d)(4)(G)), as codified in Subpart AH. Beginning January 1, 2027, CWS suppliers must comply with Section 611.881…

Section 611.883 Content of the Reports a) Each CWS supplier must provide to its customers a report(s) containing the information specified in this Section 611.884, and include a summary as specified in Section 611.886.. b) Information on the Source of the Water the Supplier Deliv…

Section 611.884 Required Additional Health Information a) All reports must prominently display the following language: "Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno-compromised persons such as persons with cancer undergo…

Section 611.885 Report Delivery and Recordkeeping a) Except as provided in subsection (g), each CWS must directly deliver a copy of the report to each customer. 1) Suppliers must use at a minimum, one of the following forms of delivery: A) Mail or hand deliver a paper copy of the…

Section 611.886 Summary of Report Contents a) Each report must include a summary displayed prominently at the beginning of the report, including a brief description of the nature of the report. b) Suppliers must include, at a minimum, the following information in the summary: 1) …

Section 611.901 General Public Notification Requirements The requirements of this Subpart V replace former notice requirements. a) Who Must Give Public Notice. Each owner or operator of a PWS (a CWS, an NTNCWS, or a transient non-CWS) must give notice for all violations of an NPD…

Section 611.902 Tier 1 Public Notice: Form, Manner, and Frequency of Notice a) Violations or Situations That Require a Tier 1 Public Notice. This subsection (a) lists the violation categories and other situations requiring a Tier 1 public notice. Appendix G identifies the tier as…

Section 611.903 Tier 2 Public Notice: Form, Manner, and Frequency of Notice a) Violations or Situations That Require a Tier 2 Public Notice. This subsection (a) lists the violation categories and other situations requiring a Tier 2 public notice. Appendix G identifies the tier as…

Section 611.904 Tier 3 Public Notice: Form, Manner, and Frequency of Notice a) Violations or Situations That Require a Tier 3 Public Notice. This subsection (a) lists the violation categories and other situations requiring a Tier 3 public notice. Appendix G identifies the tier as…

Section 611.905 Content of the Public Notice a) Elements Included in Public Notice for Violation of an NPDWR or Other Situations. When a PWS supplier violates an NPDWR or has a situation requiring public notification, each public notice must include the following elements: 1) A d…

Section 611.906 Notice to New Billing Units or New Customers a) The Requirement for a CWS. A CWS supplier must give a copy of the most recent public notice for any continuing violation, the existence of relief equivalent to a SDWA section 1415 variance or a section 1416 exemption…

Section 611.907 Special Notice of the Availability of Unregulated Contaminant Monitoring Results a) When to Give Special Notice. The owner or operator of a CWS supplier or an NTNCWS supplier required to monitor for unregulated contaminants by USEPA under 40 CFR 141.40 must notify…

Section 611.908 Special Notice for Exceedance of the Fluoride Secondary Standard a) When to Give Special Notice. A CWS supplier that exceeds the federal fluoride secondary MCL of 2 mg/ℓ (see 40 CFR 143.3)) (determined by the last single sample taken in compliance with Section 611…

Section 611.909 Special Notice for Nitrate Exceedances above the MCL by a Non-Community Water System a) When the Special Notice Is to Be Given. The owner or operator of a non-CWS supplier granted permission by the Agency under Section 611.300(d) to exceed the nitrate MCL must pro…

Section 611.910 Notice by the Agency on Behalf of a PWS a) The Agency may issue the notice required by this Subpart V on behalf of the owner and operator of the PWS supplier if the Agency complies with the requirements of this Subpart V. b) The responsibility of the PWS supplier …

Section 611.911 Special Notice for Cryptosporidium a) When the Special Notice for Repeated Failure to Monitor Must Be Given. The owner or operator of a CWS or non-CWS that is required to monitor source water under Section 611.1001 must notify persons served by its water system th…

Section 611.920 General Requirements a) USEPA has designated that the requirements of this Subpart W constitute National Primary Drinking Water Regulations. The regulations in this Subpart W establish monitoring and other requirements for identifying Subpart Y compliance monitori…

Section 611.921 Standard Monitoring a) Standard Monitoring Plan. A supplier's standard monitoring plan must comply with subsections (a)(1) through (a)(4). The supplier must prepare and submit its standard monitoring plan to the Agency according to the appropriate of the schedules…

Section 611.922 System-Specific Studies a) System-Specific Study Plan. A supplier's system-specific study plan must be based on either existing monitoring results, as required under subsection (a)(1), or modeling, as required under subsection (a)(2). The supplier must prepare and…

Section 611.923 40/30 Certification a) Eligibility. A supplier was eligible for 40/30 certification if it had no TTHM or HAA5 monitoring violations under Subpart I and no individual sample exceeded 0.040 mg/L for TTHM or 0.030 mg/L for HAA5 during an eight consecutive calendar qu…

Section 611.924 Very Small System Waivers a) If the supplier serves fewer than 500 people and it has taken TTHM and HAA5 samples under Subpart I, the supplier is not required to comply with this Subpart W unless the Agency notifies the supplier, by a SEP, that it must conduct sta…

Section 611.925 Subpart Y Compliance Monitoring Location Recommendations a) A supplier's IDSE report must include its recommendations and justification for where and during what months it will conduct TTHM and HAA5 monitoring for Subpart Y. The supplier must base its recommendati…

Section 611.950 General Requirements a) The requirements of this Subpart X constitute national primary drinking water regulations. These regulations establish requirements for filtration and disinfection that are in addition to criteria under which filtration and disinfection are…

Section 611.951 Finished Water Reservoirs a) Applicability. A Subpart B system supplier that serves fewer than 10,000 persons is subject to this requirement. b) Requirements. If a supplier begins construction of a finished water reservoir on or after March 15, 2002, the reservoir…

Section 611.952 Additional Watershed Control Requirements for Unfiltered Systems a) Applicability. A Subpart B system supplier that serves fewer than 10,000 persons that does not provide filtration must continue to comply with all of the filtration avoidance criteria in Sections …

Section 611.953 Disinfection Profile a) Applicability. A disinfection profile is a graphical representation of a system's level of Giardia lamblia or virus inactivation measured during the course of a year. A Subpart B community or non-transient non-community water system supplie…