DEL ORO RIVER ISLAND SERV TERR #1

PWSID: CA5400665 · Chico, CA · Serves 1,280 people

According to EPA Safe Drinking Water Information System (SDWIS), DEL ORO RIVER ISLAND SERV TERR #1 (PWSID CA5400665) in Chico, CA is listed as a CWS water system covering about 1,280 people. The same extract lists 176 health-based violation records spanning 2002-2024. Those 176 health-based rows for DEL ORO RIVER ISLAND SERV TERR #1 cover contaminants such as Combined Uranium, Nitrate, Coliform (TCR); they remain historical EPA registry entries, not a current compliance or drinkability score.

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Health-Based Records

DEL ORO RIVER ISLAND SERV TERR #1 has 176 health-based violation records in this historical extract. Monitoring and reporting records are not included.

Population Served
1,280
Health-Based Violation Records
176
Distinct Contaminant Codes
3
Source Type
Surface Water

PlainEnviro's health-based SDWIS extract covers monitoring and reporting violations only -- it does not include unresolved enforcement actions in progress or corrective steps a utility has taken since the extract date. 3 distinct EPA contaminant codes appear in this system's record, including Combined Uranium, Nitrate, Coliform (TCR). Recorded violations span 2002–2024. Day-to-day primacy enforcement for this system runs through the California drinking-water program, not EPA directly.

A historical health-based record does not necessarily describe current water quality or compliance. The most authoritative current source is the utility's annual Consumer Confidence Report. For enforcement history and corrective-action orders, consult EPA ECHO and the California state drinking-water program's public portal.

System Details

EPA ID (PWSID)
CA5400665
System Type
CWS
Water Source
Surface Water
Location
Chico, CA
Population Served
1,280
Health Violations
Yes (176)

What contaminants are in this water system?

Contaminant Violations Health-Based
Combined Uranium 79 79
Nitrate 73 73
Coliform (TCR) 24 24

Violation History (176)

Contaminant Health Date
Nitrate Yes Apr 1, 2024
Nitrate Yes Apr 1, 2024
Nitrate Yes Apr 1, 2024
Nitrate Yes Apr 1, 2024
Combined Uranium Yes Apr 1, 2024
Combined Uranium Yes Apr 1, 2024
Combined Uranium Yes Apr 1, 2024
Combined Uranium Yes Jan 1, 2024
Combined Uranium Yes Jan 1, 2024
Combined Uranium Yes Oct 1, 2023
Combined Uranium Yes Oct 1, 2023
Combined Uranium Yes Oct 1, 2023
Nitrate Yes Aug 1, 2023
Nitrate Yes Aug 1, 2023
Nitrate Yes Aug 1, 2023
Nitrate Yes Aug 1, 2023
Nitrate Yes Aug 1, 2023
Nitrate Yes Jul 1, 2023
Nitrate Yes Jul 1, 2023
Nitrate Yes Jul 1, 2023
Nitrate Yes Jul 1, 2023
Nitrate Yes Jul 1, 2023
Combined Uranium Yes Jul 1, 2023
Combined Uranium Yes Jul 1, 2023
Combined Uranium Yes Jul 1, 2023
Nitrate Yes Jun 1, 2023
Nitrate Yes Jun 1, 2023
Nitrate Yes Jun 1, 2023
Combined Uranium Yes Apr 1, 2023
Combined Uranium Yes Apr 1, 2023
Combined Uranium Yes Jan 1, 2023
Combined Uranium Yes Jan 1, 2023
Combined Uranium Yes Oct 1, 2022
Combined Uranium Yes Oct 1, 2022
Combined Uranium Yes Jul 1, 2022
Combined Uranium Yes Jul 1, 2022
Combined Uranium Yes Apr 1, 2022
Combined Uranium Yes Apr 1, 2022
Combined Uranium Yes Jan 1, 2022
Combined Uranium Yes Jan 1, 2022
Combined Uranium Yes Oct 1, 2021
Combined Uranium Yes Oct 1, 2021
Combined Uranium Yes Jul 1, 2021
Combined Uranium Yes Jul 1, 2021
Combined Uranium Yes Apr 1, 2021
Combined Uranium Yes Apr 1, 2021
Combined Uranium Yes Jan 1, 2021
Combined Uranium Yes Jan 1, 2021
Combined Uranium Yes Oct 1, 2020
Combined Uranium Yes Oct 1, 2020
Combined Uranium Yes Jul 1, 2020
Combined Uranium Yes Jul 1, 2020
Combined Uranium Yes Apr 1, 2020
Combined Uranium Yes Apr 1, 2020
Combined Uranium Yes Jan 1, 2020
Combined Uranium Yes Jan 1, 2020
Combined Uranium Yes Oct 1, 2019
Combined Uranium Yes Oct 1, 2019
Combined Uranium Yes Jul 1, 2019
Combined Uranium Yes Jul 1, 2019
Combined Uranium Yes Apr 1, 2019
Combined Uranium Yes Apr 1, 2019
Combined Uranium Yes Jan 1, 2019
Combined Uranium Yes Jan 1, 2019
Combined Uranium Yes Jul 1, 2018
Combined Uranium Yes Jul 1, 2018
Combined Uranium Yes Jul 1, 2018
Combined Uranium Yes Jul 1, 2018
Combined Uranium Yes Apr 1, 2018
Combined Uranium Yes Apr 1, 2018
Combined Uranium Yes Apr 1, 2018
Combined Uranium Yes Apr 1, 2018
Combined Uranium Yes Jan 1, 2018
Combined Uranium Yes Jan 1, 2018
Combined Uranium Yes Jan 1, 2018
Combined Uranium Yes Jan 1, 2018
Combined Uranium Yes Oct 1, 2017
Combined Uranium Yes Oct 1, 2017
Combined Uranium Yes Oct 1, 2017
Combined Uranium Yes Oct 1, 2017
Nitrate Yes Jul 1, 2017
Nitrate Yes Jul 1, 2017
Nitrate Yes Jul 1, 2017
Nitrate Yes Jul 1, 2017
Combined Uranium Yes Jul 1, 2017
Combined Uranium Yes Jul 1, 2017
Combined Uranium Yes Jul 1, 2017
Combined Uranium Yes Jul 1, 2017
Combined Uranium Yes Jul 1, 2016
Combined Uranium Yes Jul 1, 2016
Combined Uranium Yes Jul 1, 2016
Combined Uranium Yes Jul 1, 2016
Combined Uranium Yes Apr 1, 2016
Combined Uranium Yes Apr 1, 2016
Combined Uranium Yes Apr 1, 2016
Combined Uranium Yes Apr 1, 2016
Combined Uranium Yes Jan 1, 2016
Combined Uranium Yes Jan 1, 2016
Combined Uranium Yes Jan 1, 2016
Combined Uranium Yes Jan 1, 2016
Showing 100 of 176 violations.

Frequently Asked Questions

What does EPA SDWIS list for DEL ORO RIVER ISLAND SERV TERR #1?
DEL ORO RIVER ISLAND SERV TERR #1 has 176 health-based violation records in this historical extract. Monitoring and reporting records are not included. The system uses surface water water as its source.
How many people does DEL ORO RIVER ISLAND SERV TERR #1 serve?
DEL ORO RIVER ISLAND SERV TERR #1 serves 1,280 people in Chico, CA. It is classified as a CWS water system.
What violations does DEL ORO RIVER ISLAND SERV TERR #1 have?
DEL ORO RIVER ISLAND SERV TERR #1 has 176 health-based violation records in PlainEnviro's extract spanning 2002–2024. Monitoring and reporting records are not included.
What contaminants have been found in DEL ORO RIVER ISLAND SERV TERR #1 water?
Violations have been recorded for 3 contaminants. The most frequent: Combined Uranium, Nitrate, Coliform (TCR).

Compare beyond California

Nationwide peers by violations & population served

Cross-state SDWIS systems nearest DEL ORO RIVER ISLAND SERV TERR #1 on cumulative violation count (176) and EPA-reported population served (1,280). Violation-count peers include MAJOR COUNTY RWD #1, KWETHLUK NEW PIPED WATER SYSTEM, UNALAKLEET CITY WATER SUPPLY. Population peers include ROSE HILL WATER ASSOCIATION, ROLLA CITY OF, STAMFORD VILLAGE.

About This Data

DEL ORO RIVER ISLAND SERV TERR #1 (CA5400665) is drawn from EPA SDWIS. Health-based rows in this extract are MCL and Treatment Technique records spanning 2002-2024 covering Combined Uranium, Nitrate, Coliform (TCR). Historical registry entries, not a current drinkability score.

Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services

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