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.
DEL ORO RIVER ISLAND SERV TERR #1 has 176 health-based violation records in this historical extract. Monitoring and reporting records are not included.
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 |
Frequently Asked Questions
What does EPA SDWIS list for DEL ORO RIVER ISLAND SERV TERR #1?
How many people does DEL ORO RIVER ISLAND SERV TERR #1 serve?
What violations does DEL ORO RIVER ISLAND SERV TERR #1 have?
What contaminants have been found in DEL ORO RIVER ISLAND SERV TERR #1 water?
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.
Similar violation count
Nearest cross-state community systems (500+ served) by SDWIS violations on record.
Similar population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ gate).
Explore More
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
Read our methodology - how this data is sourced, computed, and verified.