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OAK BROOK

Illinois — Community Water System — PWSID: IL0430700

System Information

PWSIDIL0430700
System NameOAK BROOK
System TypeCommunity Water System
Water SourceSurface Water Purchased
Activity StatusActive
Owner TypeLocal
EPA Region05
Serves SchoolNo
WholesalerNo
First ReportedFeb 13, 1981
Last ReportedDec 4, 2025

Location & Contact

StateIllinois
CityOAK BROOK
ZIP Code60523
Address3003 Jorie Blvd
OrganizationO'MALLEY, TIM
Phone630-368-5276

Population & Service

Population Served9,400
Service Connections3,295

Drinking Water Violations (50)

This water system has 50 violations recorded in the EPA SDWIS database.

Begin Date End Date Contaminant Category Health-Based Major Measured Federal MCL State MCL Status Return to Compliance Rule
Jul 1, 2024 Sep 30, 2024 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2024 Sep 30, 2024 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2024 Sep 30, 2024 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2024 Sep 30, 2024 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2024 — Consumer Confidence Rule Other No No — — — Resolved Jun 11, 2025 Consumer Confidence Rule
Jul 1, 2024 — Consumer Confidence Rule Other No No — — — Resolved Jun 11, 2025 Consumer Confidence Rule
Oct 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Feb 27, 2024 Lead and Copper Rule
Oct 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Feb 27, 2024 Lead and Copper Rule
Oct 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Feb 27, 2024 Lead and Copper Rule
Oct 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Feb 27, 2024 Lead and Copper Rule
Jan 1, 2005 Mar 31, 2005 Chlorine MR No No — 4.0 mg/L — Resolved Mar 8, 2005 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2005 Mar 31, 2005 Chlorine MR No No — 4.0 mg/L — Resolved Mar 8, 2005 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2005 Mar 31, 2005 Chlorine MR No No — 4.0 mg/L — Resolved Mar 8, 2005 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2005 Mar 31, 2005 Chlorine MR No No — 4.0 mg/L — Resolved Mar 8, 2005 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 1989 Sep 30, 1993 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Mar 9, 1992 Radionuclides and Revised Rad Rule
Oct 1, 1989 Sep 30, 1993 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Mar 9, 1992 Radionuclides and Revised Rad Rule
Oct 1, 1989 Sep 30, 1993 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Mar 9, 1992 Radionuclides and Revised Rad Rule
Oct 1, 1989 Sep 30, 1993 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Mar 9, 1992 Radionuclides and Revised Rad Rule
Oct 1, 1989 Sep 30, 1993 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Mar 9, 1992 Radionuclides and Revised Rad Rule
Oct 1, 1989 Sep 30, 1993 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Mar 9, 1992 Radionuclides and Revised Rad Rule
Oct 1, 1989 Sep 30, 1993 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Mar 9, 1992 Radionuclides and Revised Rad Rule
Oct 1, 1989 Sep 30, 1993 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Mar 9, 1992 Radionuclides and Revised Rad Rule
Oct 1, 1989 Sep 30, 1993 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Mar 9, 1992 Radionuclides and Revised Rad Rule
Oct 1, 1989 Sep 30, 1993 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Mar 9, 1992 Radionuclides and Revised Rad Rule
Oct 1, 1989 Sep 30, 1993 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Mar 9, 1992 Radionuclides and Revised Rad Rule
Dec 1, 1985 Nov 30, 1989 Gross Alpha, Excl. Radon and U MCL Yes No 18.5 15 pCi/L — Resolved Jun 11, 1986 Radionuclides and Revised Rad Rule
Dec 1, 1985 Nov 30, 1989 Gross Alpha, Excl. Radon and U MCL Yes No 18.5 15 pCi/L — Resolved Jun 11, 1986 Radionuclides and Revised Rad Rule
Dec 1, 1985 Nov 30, 1989 Gross Alpha, Excl. Radon and U MCL Yes No 18.5 15 pCi/L — Resolved Jun 11, 1986 Radionuclides and Revised Rad Rule
Dec 1, 1985 Nov 30, 1989 Gross Alpha, Excl. Radon and U MCL Yes No 18.5 15 pCi/L — Resolved Jun 11, 1986 Radionuclides and Revised Rad Rule
Dec 1, 1985 Nov 30, 1989 Gross Alpha, Excl. Radon and U MCL Yes No 18.5 15 pCi/L — Resolved Jun 11, 1986 Radionuclides and Revised Rad Rule
Dec 1, 1985 Nov 30, 1989 Gross Alpha, Excl. Radon and U MCL Yes No 18.5 15 pCi/L — Resolved Jun 11, 1986 Radionuclides and Revised Rad Rule
Dec 1, 1985 Nov 30, 1989 Gross Alpha, Excl. Radon and U MCL Yes No 18.5 15 pCi/L — Resolved Jun 11, 1986 Radionuclides and Revised Rad Rule
Oct 4, 1985 Oct 3, 1989 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Oct 3, 1989 Radionuclides and Revised Rad Rule
Oct 4, 1985 Oct 3, 1989 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Oct 3, 1989 Radionuclides and Revised Rad Rule
Oct 4, 1985 Oct 3, 1989 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Oct 3, 1989 Radionuclides and Revised Rad Rule
Oct 4, 1985 Oct 3, 1989 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Oct 3, 1989 Radionuclides and Revised Rad Rule
Oct 4, 1985 Oct 3, 1989 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Oct 3, 1989 Radionuclides and Revised Rad Rule
Oct 4, 1985 Oct 3, 1989 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Oct 3, 1989 Radionuclides and Revised Rad Rule
Oct 4, 1985 Oct 3, 1989 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Oct 3, 1989 Radionuclides and Revised Rad Rule
Oct 4, 1985 Oct 3, 1989 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Oct 3, 1989 Radionuclides and Revised Rad Rule
Oct 4, 1985 Oct 3, 1989 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Oct 3, 1989 Radionuclides and Revised Rad Rule
Oct 4, 1985 Oct 3, 1989 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Oct 3, 1989 Radionuclides and Revised Rad Rule
Oct 4, 1985 Oct 3, 1989 Combined Radium (-226 and -228) MCL Yes No 7 5 pCi/L — Resolved Oct 3, 1989 Radionuclides and Revised Rad Rule
Dec 2, 1981 Dec 1, 1985 Gross Alpha, Excl. Radon and U MCL Yes No 18.5 15 pCi/L — Archived Dec 1, 1985 Radionuclides and Revised Rad Rule
Dec 2, 1981 Dec 1, 1985 Gross Alpha, Excl. Radon and U MCL Yes No 18.5 15 pCi/L — Archived Dec 1, 1985 Radionuclides and Revised Rad Rule
Dec 2, 1981 Dec 1, 1985 Gross Alpha, Excl. Radon and U MCL Yes No 18.5 15 pCi/L — Archived Dec 1, 1985 Radionuclides and Revised Rad Rule
Dec 2, 1981 Dec 1, 1985 Gross Alpha, Excl. Radon and U MCL Yes No 18.5 15 pCi/L — Archived Dec 1, 1985 Radionuclides and Revised Rad Rule
Dec 2, 1981 Dec 1, 1985 Gross Alpha, Excl. Radon and U MCL Yes No 18.5 15 pCi/L — Archived Dec 1, 1985 Radionuclides and Revised Rad Rule
Dec 2, 1981 Dec 1, 1985 Gross Alpha, Excl. Radon and U MCL Yes No 18.5 15 pCi/L — Archived Dec 1, 1985 Radionuclides and Revised Rad Rule
Jun 30, 1977 Jun 29, 1981 Gross Alpha, Excl. Radon and U MR No No — 15 pCi/L — Archived Jun 29, 1981 Radionuclides and Revised Rad Rule

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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