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ASARCO MISSION UNIT

Arizona — Non-Transient Non-Community — PWSID: AZ0420005

System Information

PWSIDAZ0420005
System NameASARCO MISSION UNIT
System TypeNon-Transient Non-Community
Water SourceGround Water
Activity StatusActive
Owner TypeMixed
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedOct 5, 1979
Last ReportedNov 17, 2025

Location & Contact

StateArizona
CitySAHUARITA
ZIP Code85629
AddressATTN JAMIE EKHOLM
OrganizationASARCO LLC MISSION COMPLEX
Phone520-393-4671

Population & Service

Population Served544
Service Connections8

Drinking Water Violations (78)

This water system has 78 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
Oct 1, 2016 Dec 31, 2016 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2016 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2015 Dec 31, 2015 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2015 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2015 Oct 31, 2015 Coliform (TCR) MR No No — 5% of samples — Resolved Oct 31, 2015 Total Coliform Rule
Oct 1, 2015 Oct 31, 2015 Coliform (TCR) MR No No — 5% of samples — Resolved Oct 31, 2015 Total Coliform Rule
Nov 1, 2014 Nov 30, 2014 Coliform (TCR) MR No No — 5% of samples — Resolved Nov 30, 2014 Total Coliform Rule
Nov 1, 2014 Nov 30, 2014 Coliform (TCR) MR No No — 5% of samples — Resolved Nov 30, 2014 Total Coliform Rule
Nov 1, 2012 Nov 30, 2012 Coliform (TCR) MR No No — 5% of samples — Resolved Nov 30, 2012 Total Coliform Rule
Nov 1, 2012 Nov 30, 2012 Coliform (TCR) MR No No — 5% of samples — Resolved Nov 30, 2012 Total Coliform Rule
Jun 1, 2012 Jun 30, 2012 Coliform (TCR) MR No No — 5% of samples — Resolved Jun 30, 2012 Total Coliform Rule
Jun 1, 2012 Jun 30, 2012 Coliform (TCR) MR No No — 5% of samples — Resolved Jun 30, 2012 Total Coliform Rule
Jul 1, 2011 Jul 31, 2011 Coliform (TCR) MR No No — 5% of samples — Resolved Jul 31, 2011 Total Coliform Rule
Jul 1, 2011 Jul 31, 2011 Coliform (TCR) MR No No — 5% of samples — Resolved Jul 31, 2011 Total Coliform Rule
Apr 1, 2011 Apr 30, 2011 Coliform (TCR) MR No No — 5% of samples — Resolved Apr 30, 2011 Total Coliform Rule
Apr 1, 2011 Apr 30, 2011 Coliform (TCR) MR No No — 5% of samples — Resolved Apr 30, 2011 Total Coliform Rule
Jun 1, 2008 Jun 30, 2008 Coliform (TCR) MR No No — 5% of samples — Resolved Jun 30, 2008 Total Coliform Rule
Jun 1, 2008 Jun 30, 2008 Coliform (TCR) MR No No — 5% of samples — Resolved Jun 30, 2008 Total Coliform Rule
Sep 1, 2006 Sep 30, 2006 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2006 Total Coliform Rule
Jul 1, 2006 Sep 30, 2006 Chlorine MR No Yes — 4.0 mg/L — Resolved Sep 30, 2006 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2001 Jul 31, 2001 Coliform (TCR) MR No No — 5% of samples — Resolved Jul 31, 2001 Total Coliform Rule
Jan 1, 2001 Dec 31, 2009 Glyphosate MR No Yes — 0.7 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 2,4-D MR No Yes — 0.07 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Dalapon MR No Yes — 0.2 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Hexachlorocyclopentadiene MR No Yes — 0.05 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 OXAMYL MR No Yes — 0.2 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Atrazine MR No Yes — 0.003 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Chlordane MR No Yes — 0.002 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 HEXACHLOROBENZENE MR No Yes — 0.001 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 1,2-DIBROMO-3-CHLOROPROPANE MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Heptachlor MR No Yes — 0.0004 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Carbofuran MR No Yes — 0.04 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Endrin MR No Yes — 0.002 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 ETHYLENE DIBROMIDE MR No Yes — 0.00005 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Dinoseb MR No Yes — 0.007 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Simazine MR No Yes — 0.004 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Heptachlor epoxide MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 2,3,7,8-TCDD MR No Yes — 0.00000003 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Picloram MR No Yes — 0.5 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Di(2-ethylhexyl) adipate MR No Yes — 0.4 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 2,4,5-TP MR No Yes — 0.05 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Endothall MR No Yes — 0.1 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Di(2-ethylhexyl) phthalate MR No Yes — 0.006 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Diquat MR No Yes — 0.02 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 Benzo(a)pyrene MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2001 Dec 31, 2009 LASSO MR No Yes — — — Resolved Dec 31, 2009 Synthetic Organic Chemicals
Jan 1, 2000 Jan 31, 2000 Coliform (TCR) MR No No — 5% of samples — Resolved Jan 31, 2000 Total Coliform Rule
Oct 1, 1999 Oct 31, 1999 Coliform (TCR) MR No No — 5% of samples — Resolved Oct 31, 1999 Total Coliform Rule
May 1, 1999 May 31, 1999 Coliform (TCR) MR No No — 5% of samples — Resolved May 31, 1999 Total Coliform Rule
Dec 1, 1998 Dec 31, 1998 Coliform (TCR) MR No No — 5% of samples — Resolved Dec 31, 1998 Total Coliform 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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