Community Water System · PWSID CA5402048

Del Oro River Island Serv Terr #2

Serves 89 peopleGroundwaterOwner: PrivateChico, California
Nothing open right now.

On record since 1997: 46 violations. 37 over the limit · 8 missed or late tests · 1 notice or report. Most recent began 2024-08-01.

For this year's test results, ask the utility for its annual Consumer Confidence Report. Every community system must publish one.

37Over the limit
0Treatment lapse
8Missed or late test
1Notice or report

More violations on record than 97% of active water systems in California. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

1997 · Over the limit: 11998 · Missed or late test: 120002001 · Over the limit: 12002 · Over the limit: 12003 · Over the limit: 12003 · Missed or late test: 12003 · Notice or report: 12004 · Over the limit: 32004 · Over the limit: 32004 · Over the limit: 32004 · Missed or late test: 12005 · Over the limit: 42005 · Over the limit: 42005 · Over the limit: 42005 · Over the limit: 42005 · Missed or late test: 120052006 · Over the limit: 42006 · Over the limit: 42006 · Over the limit: 42006 · Over the limit: 42007 · Missed or late test: 12010 · Over the limit: 32010 · Over the limit: 32010 · Over the limit: 320102011 · Over the limit: 22011 · Over the limit: 22012 · Over the limit: 32012 · Over the limit: 32012 · Over the limit: 32012 · Missed or late test: 12013 · Over the limit: 12013 · Missed or late test: 12014 · Over the limit: 120152016 · Over the limit: 12018 · Over the limit: 32018 · Over the limit: 32018 · Over the limit: 32019 · Over the limit: 52019 · Over the limit: 52019 · Over the limit: 52019 · Over the limit: 52019 · Over the limit: 52020 · Over the limit: 32020 · Over the limit: 32020 · Over the limit: 320202024 · Missed or late test: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
80% over the limit · 3717% missed or late test · 82% notice or report · 1

Across California, 52% of violations are missed or late tests and 29% are water over a limit.

How far over the limit

at the limit2×5×10×100×+Combined UraniumNitrate2020-10-01 · Combined Uranium: measured 37.00 PCI/L vs limit 20.00 PCI/L (1.9×)2020-04-01 · Combined Uranium: measured 37.70 PCI/L vs limit 20.00 PCI/L (1.9×)2020-01-01 · Combined Uranium: measured 38.50 PCI/L vs limit 20.00 PCI/L (1.9×)2019-10-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2019-10-01 · Combined Uranium: measured 38.00 PCI/L vs limit 20.00 PCI/L (1.9×)2019-07-01 · Combined Uranium: measured 37.30 PCI/L vs limit 20.00 PCI/L (1.9×)2019-04-01 · Combined Uranium: measured 37.00 PCI/L vs limit 20.00 PCI/L (1.9×)2019-01-01 · Combined Uranium: measured 36.50 PCI/L vs limit 20.00 PCI/L (1.8×)2018-10-01 · Combined Uranium: measured 38.50 PCI/L vs limit 20.00 PCI/L (1.9×)2018-07-01 · Combined Uranium: measured 36.00 PCI/L vs limit 20.00 PCI/L (1.8×)2018-04-01 · Combined Uranium: measured 35.30 PCI/L vs limit 20.00 PCI/L (1.8×)2014-01-01 · Nitrate: measured 45.60 MG/L vs limit 45.00 MG/L (1.0×)2013-04-01 · Nitrate: measured 46.40 MG/L vs limit 45.00 MG/L (1.0×)2012-10-01 · Nitrate: measured 46.94 MG/L vs limit 45.00 MG/L (1.0×)2012-04-01 · Nitrate: measured 47.80 MG/L vs limit 45.00 MG/L (1.1×)2012-01-01 · Nitrate: measured 50.00 MG/L vs limit 45.00 MG/L (1.1×)2011-04-01 · Nitrate: measured 48.00 MG/L vs limit 45.00 MG/L (1.1×)2011-01-01 · Nitrate: measured 58.00 MG/L vs limit 45.00 MG/L (1.3×)2010-10-01 · Nitrate: measured 53.00 MG/L vs limit 45.00 MG/L (1.2×)2010-04-01 · Nitrate: measured 50.00 MG/L vs limit 45.00 MG/L (1.1×)2010-01-01 · Nitrate: measured 62.00 MG/L vs limit 45.00 MG/L (1.4×)2006-10-01 · Nitrate: measured 100.00 MG/L vs limit 45.00 MG/L (2.2×)2006-07-01 · Nitrate: measured 100.00 MG/L vs limit 45.00 MG/L (2.2×)2006-04-01 · Nitrate: measured 100.00 MG/L vs limit 45.00 MG/L (2.2×)2006-01-01 · Nitrate: measured 100.00 MG/L vs limit 45.00 MG/L (2.2×)2005-10-01 · Nitrate: measured 100.00 MG/L vs limit 45.00 MG/L (2.2×)2005-01-01 · Nitrate: measured 64.00 MG/L vs limit 45.00 MG/L (1.4×)2004-12-01 · Nitrate: measured 50.00 MG/L vs limit 45.00 MG/L (1.1×)2004-07-01 · Nitrate: measured 94.00 MG/L vs limit 45.00 MG/L (2.1×)2003-07-01 · Nitrate: measured 52.90 MG/L vs limit 45.00 MG/L (1.2×)2002-01-01 · Nitrate: measured 103.00 MG/L vs limit 45.00 MG/L (2.3×)2001-01-01 · Nitrate: measured 56.70 MG/L vs limit 45.00 MG/L (1.3×)
Each dot is one over-the-limit violation: the measured value divided by the limit it broke, on a log scale. Most legal limits for chemicals are running averages set for a lifetime of drinking, so “just over” and “ten times over” are very different news. Hover a dot for the numbers.

Lead & copper at the tap

Utilities sample taps in homes most likely to have lead pipes, and report the 90th-percentile result: 9 in 10 homes sampled came in at or below this number. Above the red line (the action level) the utility must act. The action level is not a safe level; EPA's health goal for lead is zero. EPA's file does not date these results, so they are shown highest first.

Lead, 90th percentile 4 results on file · action level 15 ppb

3 ppb
3 ppb
1.4 ppb
0.29 ppb

Every violation on record

  1. 2024-08-01Revised Total Coliform RuleMONBack in compliance
  2. 2020-10-01Combined UraniumMCL, Averagemeasured 37.00 PCI/L · limit 20.00 PCI/LBack in compliance
  3. 2020-04-01Combined UraniumMCL, Averagemeasured 37.70 PCI/L · limit 20.00 PCI/LBack in compliance
  4. 2020-01-01Combined UraniumMCL, Averagemeasured 38.50 PCI/L · limit 20.00 PCI/LBack in compliance
  5. 2019-10-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LBack in compliance
  6. 2019-10-01Combined UraniumMCL, Averagemeasured 38.00 PCI/L · limit 20.00 PCI/LBack in compliance
  7. 2019-07-01Combined UraniumMCL, Averagemeasured 37.30 PCI/L · limit 20.00 PCI/LBack in compliance
  8. 2019-04-01Combined UraniumMCL, Averagemeasured 37.00 PCI/L · limit 20.00 PCI/LBack in compliance
  9. 2019-01-01Combined UraniumMCL, Averagemeasured 36.50 PCI/L · limit 20.00 PCI/LBack in compliance
  10. 2018-10-01Combined UraniumMCL, Averagemeasured 38.50 PCI/L · limit 20.00 PCI/LBack in compliance
  11. 2018-07-01Combined UraniumMCL, Averagemeasured 36.00 PCI/L · limit 20.00 PCI/LBack in compliance
  12. 2018-04-01Combined UraniumMCL, Averagemeasured 35.30 PCI/L · limit 20.00 PCI/LBack in compliance
  13. 2016-02-01Coliform (TCR)MCL, Monthly (TCR)Back in compliance
  14. 2014-01-01NitrateMCL, Single Samplemeasured 45.60 MG/L · limit 45.00 MG/LBack in compliance
  15. 2013-04-01NitrateMCL, Single Samplemeasured 46.40 MG/L · limit 45.00 MG/LBack in compliance
  16. 2013-01-01NitrateMonitoring, RegularBack in compliance
  17. 2012-10-01NitrateMCL, Single Samplemeasured 46.94 MG/L · limit 45.00 MG/LBack in compliance
  18. 2012-04-01NitrateMCL, Single Samplemeasured 47.80 MG/L · limit 45.00 MG/LBack in compliance
  19. 2012-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  20. 2012-01-01NitrateMCL, Single Samplemeasured 50.00 MG/L · limit 45.00 MG/LBack in compliance
  21. 2011-04-01NitrateMCL, Single Samplemeasured 48.00 MG/L · limit 45.00 MG/LBack in compliance
  22. 2011-01-01NitrateMCL, Single Samplemeasured 58.00 MG/L · limit 45.00 MG/LBack in compliance
  23. 2010-10-01NitrateMCL, Single Samplemeasured 53.00 MG/L · limit 45.00 MG/LBack in compliance
  24. 2010-04-01NitrateMCL, Single Samplemeasured 50.00 MG/L · limit 45.00 MG/LBack in compliance
  25. 2010-01-01NitrateMCL, Single Samplemeasured 62.00 MG/L · limit 45.00 MG/LBack in compliance
Show the other 21 entries
  1. 2007-03-01Coliform (TCR)Monitoring, Routine Major (TCR)Back in compliance
  2. 2006-10-01NitrateMCL, Single Samplemeasured 100.00 MG/L · limit 45.00 MG/LBack in compliance
  3. 2006-07-01NitrateMCL, Single Samplemeasured 100.00 MG/L · limit 45.00 MG/LBack in compliance
  4. 2006-04-01NitrateMCL, Single Samplemeasured 100.00 MG/L · limit 45.00 MG/LBack in compliance
  5. 2006-01-01NitrateMCL, Single Samplemeasured 100.00 MG/L · limit 45.00 MG/LBack in compliance
  6. 2005-10-01NitrateMCL, Single Samplemeasured 100.00 MG/L · limit 45.00 MG/LBack in compliance
  7. 2005-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  8. 2005-04-01Coliform (TCR)MCL, Monthly (TCR)Back in compliance
  9. 2005-02-01Coliform (TCR)MCL, Monthly (TCR)Back in compliance
  10. 2005-01-01NitrateMCL, Single Samplemeasured 64.00 MG/L · limit 45.00 MG/LBack in compliance
  11. 2004-12-01NitrateMCL, Single Samplemeasured 50.00 MG/L · limit 45.00 MG/LBack in compliance
  12. 2004-11-01Coliform (TCR)MCL, Monthly (TCR)Back in compliance
  13. 2004-07-01NitrateMCL, Single Samplemeasured 94.00 MG/L · limit 45.00 MG/LBack in compliance
  14. 2004-01-01NitrateMonitoring, RegularBack in compliance
  15. 2003-10-01NitrateMonitoring, RegularBack in compliance
  16. 2003-07-01NitrateMCL, Single Samplemeasured 52.90 MG/L · limit 45.00 MG/LBack in compliance
  17. 2003-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  18. 2002-01-01NitrateMCL, Single Samplemeasured 103.00 MG/L · limit 45.00 MG/LBack in compliance
  19. 2001-01-01NitrateMCL, Single Samplemeasured 56.70 MG/L · limit 45.00 MG/LBack in compliance
  20. 1998-01-01Coliform (TCR)Monitoring, Routine Major (TCR)Back in compliance
  21. 1997-08-01Coliform (TCR)MCL, Monthly (TCR)Back in compliance

System details

Population served89
Service connections27
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CityChico
EPA ZIP on file95927

Areas served

  • Tulare County

Reading this record

Del Oro River Island Serv Terr #2 is a community water system that draws from groundwater and serves about 89 people in Chico, California. Everything above comes from the EPA's Safe Drinking Water Information System (SDWIS), where states report every violation by every public water system.

Four kinds of violation. Only one is a measurement of the water: over the limit means a test came back above a legal maximum (an MCL). A treatment lapse means a required protective step was not done, such as disinfection, filtration, fixing a defect an inspector found, or filing a lead-pipe inventory. A missed or late test means a required test was skipped or never reported. That is the most common kind, and the most misread: it does not mean the water was bad, and it does not mean the water was fine. Notices and reports covers public notices and the annual Consumer Confidence Report.

Status. “Back in compliance” means the state recorded a return to compliance. “Period ended” means the violation's compliance period is over but no return to compliance was ever filed, which is common in older records. EPA's federal copy lags state records by months, so call the utility for anything current.