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GWA CENTRAL WATER SYSTEM

GU — Community Water System — PWSID: GU0000003

System Information

PWSIDGU0000003
System NameGWA CENTRAL WATER SYSTEM
System TypeCommunity Water System
Water SourceSurface Water Purchased
Activity StatusActive
Owner TypeState
EPA Region09
Serves SchoolNo
WholesalerYes
First ReportedMar 10, 1980
Last ReportedDec 30, 2025

Location & Contact

StateGU
CityMANGILAO
ZIP Code96913
AddressGloria B. Nelson Public Service Building
OrganizationBORDALLO, MIGUEL
Phone671-300-6845

Population & Service

Population Served21,398
Service Connections3,295

Drinking Water Violations (72)

This water system has 72 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
Apr 1, 2022 Apr 30, 2022 Revised Total Coliform Rule MCL Yes No — — — Resolved Apr 28, 2022 Revised Total Coliform Rule
Apr 1, 2022 Apr 30, 2022 Revised Total Coliform Rule MCL Yes No — — — Resolved Apr 28, 2022 Revised Total Coliform Rule
Apr 1, 2022 Apr 30, 2022 Revised Total Coliform Rule MCL Yes No — — — Resolved Apr 28, 2022 Revised Total Coliform Rule
Apr 1, 2022 Apr 30, 2022 Revised Total Coliform Rule MCL Yes No — — — Resolved Apr 28, 2022 Revised Total Coliform Rule
Jan 1, 2012 Mar 31, 2012 Total Haloacetic Acids (HAA5) MCL Yes No .072 MG/L 0.060 mg/L — Resolved Mar 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2012 Mar 31, 2012 TTHM MCL Yes No .148 MG/L 0.080 mg/L — Resolved Mar 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2012 Mar 31, 2012 TTHM MCL Yes No .148 MG/L 0.080 mg/L — Resolved Mar 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2012 Mar 31, 2012 TTHM MCL Yes No .148 MG/L 0.080 mg/L — Resolved Mar 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2012 Dec 31, 2012 Beryllium, Total MR No Yes — 0.004 mg/L — Resolved Apr 23, 2012 Inorganic Chemicals
Jan 1, 2012 Dec 31, 2012 Thallium, Total MR No Yes — 0.002 mg/L — Resolved Apr 23, 2012 Inorganic Chemicals
Jan 1, 2012 Dec 31, 2012 Chromium MR No Yes — 0.1 mg/L — Resolved Apr 23, 2012 Inorganic Chemicals
Jan 1, 2012 Dec 31, 2012 Arsenic MR No Yes — 0.010 mg/L — Resolved Apr 23, 2012 Arsenic Rule
Jan 1, 2012 Mar 31, 2012 Total Haloacetic Acids (HAA5) MCL Yes No .072 MG/L 0.060 mg/L — Resolved Mar 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2012 Mar 31, 2012 Total Haloacetic Acids (HAA5) MCL Yes No .072 MG/L 0.060 mg/L — Resolved Mar 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2012 Dec 31, 2012 Selenium MR No Yes — 0.05 mg/L — Resolved Apr 23, 2012 Inorganic Chemicals
Jan 1, 2012 Dec 31, 2012 Selenium MR No Yes — 0.05 mg/L — Resolved Apr 23, 2012 Inorganic Chemicals
Jan 1, 2012 Dec 31, 2012 Selenium MR No Yes — 0.05 mg/L — Resolved Apr 23, 2012 Inorganic Chemicals
Jan 1, 2012 Dec 31, 2012 Antimony, Total MR No Yes — 0.006 mg/L — Resolved Apr 23, 2012 Inorganic Chemicals
Jan 1, 2012 Dec 31, 2012 Mercury MR No Yes — 0.002 mg/L — Resolved Apr 23, 2012 Inorganic Chemicals
Jan 1, 2012 Dec 31, 2012 CYANIDE MR No Yes — 0.2 mg/L — Resolved Apr 23, 2012 Inorganic Chemicals
Jan 1, 2012 Dec 31, 2012 Barium MR No Yes — 2 mg/L — Resolved Apr 23, 2012 Inorganic Chemicals
Jan 1, 2012 Dec 31, 2012 Cadmium MR No Yes — 0.005 mg/L — Resolved Apr 23, 2012 Inorganic Chemicals
Jan 1, 2012 Dec 31, 2012 Barium MR No Yes — 2 mg/L — Resolved Apr 23, 2012 Inorganic Chemicals
Jan 1, 2012 — Public Notice Other No No — — — Resolved May 28, 2014 Public Notice Rule and Revised PN Rule
Oct 1, 2011 Dec 31, 2011 TTHM MCL Yes No .145 MG/L 0.080 mg/L — Resolved Dec 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2011 Dec 31, 2011 Total Haloacetic Acids (HAA5) MCL Yes No .068 MG/L 0.060 mg/L — Resolved Dec 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2011 Dec 31, 2011 Total Haloacetic Acids (HAA5) MCL Yes No .068 MG/L 0.060 mg/L — Resolved Dec 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2011 Dec 31, 2011 Total Haloacetic Acids (HAA5) MCL Yes No .068 MG/L 0.060 mg/L — Resolved Dec 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2011 Dec 31, 2011 Total Haloacetic Acids (HAA5) MCL Yes No .068 MG/L 0.060 mg/L — Resolved Dec 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2011 — Public Notice Other No No — — — Resolved May 28, 2014 Public Notice Rule and Revised PN Rule
Oct 1, 2011 Dec 31, 2011 TTHM MCL Yes No .145 MG/L 0.080 mg/L — Resolved Dec 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2011 Dec 31, 2011 TTHM MCL Yes No .145 MG/L 0.080 mg/L — Resolved Dec 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2011 Sep 30, 2011 Total Haloacetic Acids (HAA5) MCL Yes No .07 MG/L 0.060 mg/L — Resolved Sep 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2011 Sep 30, 2011 TTHM MCL Yes No .139 MG/L 0.080 mg/L — Resolved Sep 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2011 Sep 30, 2011 TTHM MCL Yes No .139 MG/L 0.080 mg/L — Resolved Sep 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2011 Sep 30, 2011 TTHM MCL Yes No .139 MG/L 0.080 mg/L — Resolved Sep 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2011 Sep 30, 2011 TTHM MCL Yes No .139 MG/L 0.080 mg/L — Resolved Sep 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2011 Jul 31, 2011 Coliform (TCR) MCL Yes No — 5% of samples — Archived Jul 31, 2011 Total Coliform Rule
Jul 1, 2011 — Public Notice Other No No — — — Resolved May 28, 2014 Public Notice Rule and Revised PN Rule
Jul 1, 2011 Jul 31, 2011 Coliform (TCR) MCL Yes No — 5% of samples — Archived Jul 31, 2011 Total Coliform Rule
Jul 1, 2011 Sep 30, 2011 Total Haloacetic Acids (HAA5) MCL Yes No .07 MG/L 0.060 mg/L — Resolved Sep 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2011 Jul 31, 2011 Coliform (TCR) MCL Yes No — 5% of samples — Archived Jul 31, 2011 Total Coliform Rule
Apr 1, 2011 — Public Notice Other No No — — — Resolved May 28, 2014 Public Notice Rule and Revised PN Rule
Apr 1, 2011 Jun 30, 2011 TTHM MCL Yes No .121 MG/L 0.080 mg/L — Resolved Jun 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2011 Jun 30, 2011 TTHM MCL Yes No .121 MG/L 0.080 mg/L — Resolved Jun 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2011 Jun 30, 2011 TTHM MCL Yes No .121 MG/L 0.080 mg/L — Resolved Jun 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2011 Jun 30, 2011 TTHM MCL Yes No .121 MG/L 0.080 mg/L — Resolved Jun 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2011 — Public Notice Other No No — — — Resolved May 28, 2014 Public Notice Rule and Revised PN Rule
Jan 1, 2011 Mar 31, 2011 TTHM MCL Yes No .104 MG/L 0.080 mg/L — Resolved Mar 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2011 Mar 31, 2011 TTHM MCL Yes No .104 MG/L 0.080 mg/L — Resolved Mar 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts 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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