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DEL ORO RIVER ISLAND SERV TERR #1

California — Community Water System — PWSID: CA5400665

System Information

PWSIDCA5400665
System NameDEL ORO RIVER ISLAND SERV TERR #1
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypePrivate
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedMar 22, 1979
Last ReportedNov 17, 2025

Location & Contact

StateCalifornia
CityCHICO
ZIP Code95927
AddressDRAWER 5172
OrganizationFORTINO, ROBERT
Phone530-894-1100

Population & Service

Population Served1,280
Service Connections388

Drinking Water Violations (141)

This water system has 141 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, 2024 Jun 30, 2024 Nitrate MCL Yes No 13 MG/L 10 mg/L 10 Archived Jun 30, 2024 Nitrate Rule
Apr 1, 2024 Jun 30, 2024 Nitrate MCL Yes No 13 MG/L 10 mg/L 10 Archived Jun 30, 2024 Nitrate Rule
Apr 1, 2024 Jun 30, 2024 Combined Uranium MCL Yes No 41.3 PCI/L 30 ug/L 20 Archived Jun 30, 2024 Radionuclides and Revised Rad Rule
Jan 1, 2024 Mar 31, 2024 Combined Uranium MCL Yes No 39.2 PCI/L 30 ug/L 20 Archived Mar 31, 2024 Radionuclides and Revised Rad Rule
Oct 1, 2023 Dec 31, 2023 Combined Uranium MCL Yes No 44 PCI/L 30 ug/L 20 Archived Dec 31, 2023 Radionuclides and Revised Rad Rule
Aug 1, 2023 Aug 31, 2023 Nitrate MCL Yes No 13 MG/L 10 mg/L 10 Archived Aug 31, 2023 Nitrate Rule
Jul 1, 2023 Jul 31, 2023 Nitrate MCL Yes No 11.3 MG/L 10 mg/L 10 Archived Jul 31, 2023 Nitrate Rule
Jul 1, 2023 Sep 30, 2023 Combined Uranium MCL Yes No 42.3 PCI/L 30 ug/L 20 Archived Sep 30, 2023 Radionuclides and Revised Rad Rule
Jun 1, 2023 Jun 30, 2023 Nitrate MCL Yes No 11.7 MG/L 10 mg/L 10 Archived Jun 30, 2023 Nitrate Rule
Apr 1, 2023 Jun 30, 2023 Combined Uranium MCL Yes No 42.8 PCI/L 30 ug/L 20 Archived Jun 30, 2023 Radionuclides and Revised Rad Rule
Jan 1, 2023 Mar 31, 2023 Combined Uranium MCL Yes No 44.1 PCI/L 30 ug/L 20 Archived Mar 31, 2023 Radionuclides and Revised Rad Rule
Oct 1, 2022 Dec 31, 2022 Combined Uranium MCL Yes No 44.7 PCI/L 30 ug/L 20 Archived Dec 31, 2022 Radionuclides and Revised Rad Rule
Jul 1, 2022 Sep 30, 2022 Combined Uranium MCL Yes No 46 PCI/L 30 ug/L 20 Archived Sep 30, 2022 Radionuclides and Revised Rad Rule
Apr 1, 2022 Jun 30, 2022 Combined Uranium MCL Yes No 47.3 PCI/L 30 ug/L 20 Archived Jun 30, 2022 Radionuclides and Revised Rad Rule
Jan 1, 2022 Mar 31, 2022 Combined Uranium MCL Yes No 47.5 PCI/L 30 ug/L 20 Archived Mar 31, 2022 Radionuclides and Revised Rad Rule
Oct 1, 2021 Dec 31, 2021 Combined Uranium MCL Yes No 48 PCI/L 30 ug/L 20 Archived Dec 31, 2021 Radionuclides and Revised Rad Rule
Jul 1, 2021 Sep 30, 2021 Combined Uranium MCL Yes No 48.5 PCI/L 30 ug/L 20 Archived Sep 30, 2021 Radionuclides and Revised Rad Rule
Apr 1, 2021 Jun 30, 2021 Combined Uranium MCL Yes No 46.8 PCI/L 30 ug/L 20 Archived Jun 30, 2021 Radionuclides and Revised Rad Rule
Jan 1, 2021 Mar 31, 2021 Combined Uranium MCL Yes No 43.8 PCI/L 30 ug/L 20 Archived Mar 31, 2021 Radionuclides and Revised Rad Rule
Oct 1, 2020 Dec 31, 2020 Combined Uranium MCL Yes No 43 PCI/L 30 ug/L 20 Archived Dec 31, 2020 Radionuclides and Revised Rad Rule
Jul 1, 2020 Sep 30, 2020 Combined Uranium MCL Yes No 41.8 PCI/L 30 ug/L 20 Archived Sep 30, 2020 Radionuclides and Revised Rad Rule
Apr 1, 2020 Jun 30, 2020 Combined Uranium MCL Yes No 42 PCI/L 30 ug/L 20 Archived Jun 30, 2020 Radionuclides and Revised Rad Rule
Jan 1, 2020 Mar 31, 2020 Combined Uranium MCL Yes No 43.6 PCI/L 30 ug/L 20 Archived Mar 31, 2020 Radionuclides and Revised Rad Rule
Oct 1, 2019 Dec 31, 2019 Combined Uranium MCL Yes No 41.8 PCI/L 30 ug/L 20 Archived Dec 31, 2019 Radionuclides and Revised Rad Rule
Jul 1, 2019 Sep 30, 2019 Combined Uranium MCL Yes No 41.6 PCI/L 30 ug/L 20 Archived Sep 30, 2019 Radionuclides and Revised Rad Rule
Apr 1, 2019 Jun 30, 2019 Combined Uranium MCL Yes No 41.8 PCI/L 30 ug/L 20 Archived Jun 30, 2019 Radionuclides and Revised Rad Rule
Jan 1, 2019 Mar 31, 2019 Combined Uranium MCL Yes No 42.8 PCI/L 30 ug/L 20 Archived Mar 31, 2019 Radionuclides and Revised Rad Rule
Jul 1, 2018 Sep 30, 2018 Combined Uranium MCL Yes No 45 PCI/L 30 ug/L 20 Archived Sep 30, 2018 Radionuclides and Revised Rad Rule
Apr 1, 2018 Jun 30, 2018 Combined Uranium MCL Yes No 45 PCI/L 30 ug/L 20 Archived Jun 30, 2018 Radionuclides and Revised Rad Rule
Jan 1, 2018 Mar 31, 2018 Combined Uranium MCL Yes No 41 PCI/L 30 ug/L 20 Archived Mar 31, 2018 Radionuclides and Revised Rad Rule
Oct 1, 2017 Dec 31, 2017 Combined Uranium MCL Yes No 31 PCI/L 30 ug/L 20 Archived Dec 31, 2017 Radionuclides and Revised Rad Rule
Jul 1, 2017 Sep 30, 2017 Combined Uranium MCL Yes No 32.4 PCI/L 30 ug/L 20 Archived Sep 30, 2017 Radionuclides and Revised Rad Rule
Jul 1, 2017 Sep 30, 2017 Nitrate MCL Yes No 12.1 MG/L 10 mg/L 10 Resolved Sep 30, 2017 Nitrate Rule
Jul 1, 2017 Sep 30, 2017 Nitrate MCL Yes No 12.1 MG/L 10 mg/L 10 Resolved Sep 30, 2017 Nitrate Rule
Jul 1, 2016 Sep 30, 2016 Nitrate MR No Yes — 10 mg/L — Resolved Sep 30, 2016 Nitrate Rule
Jul 1, 2016 Sep 30, 2016 Nitrate MR No Yes — 10 mg/L — Resolved Sep 30, 2016 Nitrate Rule
Jul 1, 2016 Sep 30, 2016 Combined Uranium MCL Yes No 31.4 PCI/L 30 ug/L 20 Archived Sep 30, 2016 Radionuclides and Revised Rad Rule
Apr 1, 2016 Jun 30, 2016 Combined Uranium MCL Yes No 31.6 PCI/L 30 ug/L 20 Archived Jun 30, 2016 Radionuclides and Revised Rad Rule
Jan 1, 2016 Mar 31, 2016 Combined Uranium MCL Yes No 33.4 PCI/L 30 ug/L 20 Archived Mar 31, 2016 Radionuclides and Revised Rad Rule
Oct 1, 2015 Dec 31, 2015 Combined Uranium MCL Yes No 33.2 PCI/L 30 ug/L 20 Archived Dec 31, 2015 Radionuclides and Revised Rad Rule
Jul 1, 2015 Sep 30, 2015 Combined Uranium MCL Yes No 29.7 PCI/L 30 ug/L 20 Archived Sep 30, 2015 Radionuclides and Revised Rad Rule
Apr 1, 2015 Jun 30, 2015 Combined Uranium MCL Yes No 32.5 PCI/L 30 ug/L 20 Archived Jun 30, 2015 Radionuclides and Revised Rad Rule
Jan 1, 2015 Mar 31, 2015 Combined Uranium MCL Yes No 35.9 PCI/L 30 ug/L 20 Archived Mar 31, 2015 Radionuclides and Revised Rad Rule
Oct 1, 2014 Dec 31, 2014 Combined Uranium MCL Yes No 31.7 PCI/L 30 ug/L 20 Archived Dec 31, 2014 Radionuclides and Revised Rad Rule
Jul 1, 2014 Sep 30, 2014 Combined Uranium MCL Yes No 42.4 PCI/L 30 ug/L 20 Archived Sep 30, 2014 Radionuclides and Revised Rad Rule
Apr 1, 2014 Jun 30, 2014 Combined Uranium MCL Yes No 47.6 PCI/L 30 ug/L 20 Archived Jun 30, 2014 Radionuclides and Revised Rad Rule
Jan 1, 2014 Mar 31, 2014 Combined Uranium MCL Yes No 48.9 PCI/L 30 ug/L 20 Archived Mar 31, 2014 Radionuclides and Revised Rad Rule
Oct 1, 2013 Dec 31, 2013 Combined Uranium MCL Yes No 54.7 PCI/L 30 ug/L — Archived Dec 31, 2013 Radionuclides and Revised Rad Rule
Jul 1, 2013 Sep 30, 2013 Combined Uranium MCL Yes No 47.3 PCI/L 30 ug/L 20 Archived Sep 30, 2013 Radionuclides and Revised Rad Rule
Apr 1, 2013 Jun 30, 2013 Combined Uranium MCL Yes No 41.5 PCI/L 30 ug/L 20 Archived Jun 30, 2013 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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