Community Water System · PWSID 090605129

Oasis Mobile Home Park

Serves 1,350 peopleGroundwaterOwner: PrivateThermal, California

2 open treatment violations.

Open for: Groundwater Rule. EPA counts treatment-technique violations as health-based: a required protective step was not done. It is not a measurement of contamination.

On record since 2000: 195 violations. 14 over the limit · 3 treatment lapses · 140 missed or late tests · 38 notices or reports. Most recent began 2024-05-01.

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

14Over the limit

3Treatment lapse2 open

140Missed or late test

38Notice or report

More violations on record than 99% 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

One square ≈ 6 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.

7% over the limit · 142% treatment lapse · 372% missed or late test · 14019% notice or report · 38

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

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 7 results on file · action level 15 ppb

5.1 ppb

below 5 ppb

2.7 ppb

1.3 ppb

1 ppb

Open now (2)

2021-03-31Groundwater Rule ×2Failure To Address DeficiencyOpen

Every violation on record

2024-05-01Revised Total Coliform RuleRPTBack in compliance
2024-02-01Revised Total Coliform RuleRPTBack in compliance
2023-06-01Revised Total Coliform RuleRPTBack in compliance
2023-04-01Revised Total Coliform RuleRPTBack in compliance
2023-04-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
2022-10-01ArsenicMCL, Averagemeasured 0.0240 MG/LPeriod ended · no return to compliance on file
2022-07-01ArsenicMCL, Averagemeasured 0.0444 MG/LBack in compliance
2022-04-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2022-04-01ArsenicMCL, Averagemeasured 0.0627 MG/LPeriod ended · no return to compliance on file
2022-01-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2022-01-01Trihalomethanes (TTHM)Monitoring, Routine (IDSE)Period ended · no return to compliance on file
2022-01-01Total Haloacetic Acids (HAA5)Monitoring, Routine (IDSE)Period ended · no return to compliance on file
2022-01-01StyreneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01EthylbenzeneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01TolueneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01BenzeneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01ChlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01TetrachloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-011,1,2-TrichloroethaneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01TrichloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-011,2-DichloropropaneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01Carbon tetrachlorideMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-011,1,1-TrichloroethaneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-011,2-DichloroethaneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01trans-1,2-DichloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file

Show the other 164 entries

2022-01-011,1-DichloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01Vinyl chlorideMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01p-DichlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01o-DichlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01DichloromethaneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01Xylenes, TotalMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01cis-1,2-DichloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-011,2,4-TrichlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
2022-01-01ArsenicMCL, Averagemeasured 0.0765 MG/LPeriod ended · no return to compliance on file
2021-11-01Revised Total Coliform RuleRPTBack in compliance
2021-10-01ArsenicMCL, Averagemeasured 0.0817 MG/LPeriod ended · no return to compliance on file
2021-07-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2021-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
2021-07-01Combined Radium (-226 and -228)Monitoring, RegularBack in compliance
2021-07-01Combined UraniumMonitoring, RegularBack in compliance
2021-07-01Gross Alpha, Excl. Radon and UMonitoring, RegularBack in compliance
2021-07-01Ethylene DibromideMonitoring, RegularBack in compliance
2021-07-011, 2-Dibromo-3-ChloropropaneMonitoring, RegularBack in compliance
2021-07-01PentachlorophenolMonitoring, RegularBack in compliance
2021-07-012, 4, 5-TpMonitoring, RegularBack in compliance
2021-07-012, 4-DMonitoring, RegularBack in compliance
2021-07-012, 3, 7, 8-TcddMonitoring, RegularBack in compliance
2021-07-01CarbofuranMonitoring, RegularBack in compliance
2021-07-01DinosebMonitoring, RegularBack in compliance
2021-07-01PicloramMonitoring, RegularBack in compliance
2021-07-01OxamylMonitoring, RegularBack in compliance
2021-07-01EndothallMonitoring, RegularBack in compliance
2021-07-01DiquatMonitoring, RegularBack in compliance
2021-07-01DalaponMonitoring, RegularBack in compliance
2021-07-01NitriteMonitoring, RegularBack in compliance
2021-07-01NitrateMonitoring, RegularBack in compliance
2021-07-01ArsenicMCL, Averagemeasured 0.0810 MG/LPeriod ended · no return to compliance on file
2021-04-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2021-04-01ChlorineMonitoring and Reporting (DBP)Back in compliance
2021-04-01Combined Radium (-226 and -228)Monitoring, RegularBack in compliance
2021-04-01Gross Alpha, Excl. Radon and UMonitoring, RegularBack in compliance
2021-04-012, 3, 7, 8-TcddMonitoring, RegularBack in compliance
2021-04-01DiquatMonitoring, RegularBack in compliance
2021-04-01ArsenicMCL, Averagemeasured 0.0821 MG/LPeriod ended · no return to compliance on file
2021-03-31Groundwater Rule ×2Failure To Address DeficiencyOpen
2021-03-31Public Notice ×3PN Violation for NPDWR ViolationBack in compliance
2021-03-31Groundwater RuleFailure To Address DeficiencyBack in compliance
2021-01-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2021-01-01ArsenicMCL, Averagemeasured 0.0855 MG/LPeriod ended · no return to compliance on file
2020-11-01Revised Total Coliform RuleRPTBack in compliance
2020-10-01Public Notice ×2PN Violation for NPDWR ViolationBack in compliance
2020-10-01Combined Radium (-226 and -228)Monitoring, RegularBack in compliance
2020-10-01Combined UraniumMonitoring, RegularBack in compliance
2020-10-01Gross Alpha, Excl. Radon and UMonitoring, RegularBack in compliance
2020-10-01StyreneMonitoring, RegularBack in compliance
2020-10-01EthylbenzeneMonitoring, RegularBack in compliance
2020-10-01TolueneMonitoring, RegularBack in compliance
2020-10-01BenzeneMonitoring, RegularBack in compliance
2020-10-01ChlorobenzeneMonitoring, RegularBack in compliance
2020-10-01TetrachloroethyleneMonitoring, RegularBack in compliance
2020-10-011,1,2-TrichloroethaneMonitoring, RegularBack in compliance
2020-10-01TrichloroethyleneMonitoring, RegularBack in compliance
2020-10-011,2-DichloropropaneMonitoring, RegularBack in compliance
2020-10-01Carbon tetrachlorideMonitoring, RegularBack in compliance
2020-10-011,1,1-TrichloroethaneMonitoring, RegularBack in compliance
2020-10-011,2-DichloroethaneMonitoring, RegularBack in compliance
2020-10-01trans-1,2-DichloroethyleneMonitoring, RegularBack in compliance
2020-10-011,1-DichloroethyleneMonitoring, RegularBack in compliance
2020-10-01Vinyl chlorideMonitoring, RegularBack in compliance
2020-10-01p-DichlorobenzeneMonitoring, RegularBack in compliance
2020-10-01o-DichlorobenzeneMonitoring, RegularBack in compliance
2020-10-01DichloromethaneMonitoring, RegularBack in compliance
2020-10-01ChlordaneMonitoring, RegularBack in compliance
2020-10-01Xylenes, TotalMonitoring, RegularBack in compliance
2020-10-01Ethylene DibromideMonitoring, RegularBack in compliance
2020-10-011, 2-Dibromo-3-ChloropropaneMonitoring, RegularBack in compliance
2020-10-01Total Polychlorinated Biphenyls (PCB)Monitoring, RegularBack in compliance
2020-10-01cis-1,2-DichloroethyleneMonitoring, RegularBack in compliance
2020-10-011,2,4-TrichlorobenzeneMonitoring, RegularBack in compliance
2020-10-01PentachlorophenolMonitoring, RegularBack in compliance
2020-10-01Benzo(a)pyreneMonitoring, RegularBack in compliance
2020-10-01HexachlorobenzeneMonitoring, RegularBack in compliance
2020-10-012, 4, 5-TpMonitoring, RegularBack in compliance
2020-10-012, 4-DMonitoring, RegularBack in compliance
2020-10-01Heptachlor epoxideMonitoring, RegularBack in compliance
2020-10-01HeptachlorMonitoring, RegularBack in compliance
2020-10-012, 3, 7, 8-TcddMonitoring, RegularBack in compliance
2020-10-01LassoMonitoring, RegularBack in compliance
2020-10-01AtrazineMonitoring, RegularBack in compliance
2020-10-01CarbofuranMonitoring, RegularBack in compliance
2020-10-01HexachlorocyclopentadieneMonitoring, RegularBack in compliance
2020-10-01DinosebMonitoring, RegularBack in compliance
2020-10-01PicloramMonitoring, RegularBack in compliance
2020-10-01Di(2-ethylhexyl) phthalateMonitoring, RegularBack in compliance
2020-10-01SimazineMonitoring, RegularBack in compliance
2020-10-01OxamylMonitoring, RegularBack in compliance
2020-10-01Di(2-ethylhexyl) adipateMonitoring, RegularBack in compliance
2020-10-01GlyphosateMonitoring, RegularBack in compliance
2020-10-01EndothallMonitoring, RegularBack in compliance
2020-10-01DiquatMonitoring, RegularBack in compliance
2020-10-01DalaponMonitoring, RegularBack in compliance
2020-10-01ToxapheneMonitoring, RegularBack in compliance
2020-10-01MethoxychlorMonitoring, RegularBack in compliance
2020-10-01Bhc-GammaMonitoring, RegularBack in compliance
2020-10-01EndrinMonitoring, RegularBack in compliance
2020-10-01NitriteMonitoring, RegularBack in compliance
2020-10-01NitrateMonitoring, RegularBack in compliance
2020-10-01ArsenicMCL, Averagemeasured 0.0844 MG/LBack in compliance
2020-07-01ArsenicMCL, Averagemeasured 0.0835 MG/LPeriod ended · no return to compliance on file
2020-04-01Revised Total Coliform RuleMONBack in compliance
2020-03-01Revised Total Coliform RuleMONBack in compliance
2020-02-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2020-02-01Revised Total Coliform RuleMONBack in compliance
2020-01-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2020-01-01Revised Total Coliform RuleMONBack in compliance
2020-01-01ArsenicMCL, Averagemeasured 0.0203 MG/LBack in compliance
2019-11-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2019-11-01Revised Total Coliform RuleMONBack in compliance
2019-10-01Public Notice ×2PN Violation for NPDWR ViolationBack in compliance
2019-10-01Revised Total Coliform RuleMONBack in compliance
2019-10-01ArsenicMCL, Averagemeasured 0.0203 MG/LBack in compliance
2019-08-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2019-08-01Revised Total Coliform RuleMONBack in compliance
2019-07-01ArsenicMCL, Averagemeasured 0.0267 MG/LBack in compliance
2019-06-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2019-06-01Revised Total Coliform RuleMONBack in compliance
2019-05-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2019-05-01Revised Total Coliform RuleMONBack in compliance
2019-04-01Public Notice ×2PN Violation for NPDWR ViolationBack in compliance
2019-04-01Revised Total Coliform RuleMONBack in compliance
2019-04-01ArsenicMCL, Averagemeasured 0.0221 MG/LBack in compliance
2019-03-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2019-03-01Revised Total Coliform RuleMONBack in compliance
2019-02-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2019-02-01Revised Total Coliform RuleMONBack in compliance
2019-01-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2019-01-01Revised Total Coliform RuleMONBack in compliance
2019-01-01Trihalomethanes (TTHM)Monitoring, Routine (IDSE)Back in compliance
2019-01-01Total Haloacetic Acids (HAA5)Monitoring, Routine (IDSE)Back in compliance
2019-01-01ArsenicMonitoring, RegularBack in compliance
2018-12-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2018-12-01Revised Total Coliform RuleMONBack in compliance
2018-11-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2018-11-01Revised Total Coliform RuleMONBack in compliance
2018-10-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2018-10-01Revised Total Coliform RuleMONBack in compliance
2018-10-01ArsenicMonitoring, RegularBack in compliance
2018-09-01Public NoticePN Violation for NPDWR ViolationBack in compliance
2018-09-01Revised Total Coliform RuleMONBack in compliance
2018-01-01Trihalomethanes (TTHM)Monitoring, Routine (IDSE)Back in compliance
2018-01-01Total Haloacetic Acids (HAA5)Monitoring, Routine (IDSE)Back in compliance
2018-01-01NitrateMonitoring, RegularBack in compliance
2017-07-01ArsenicMonitoring, RegularBack in compliance
2017-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
2017-01-01Trihalomethanes (TTHM)Monitoring, Routine (IDSE)Back in compliance
2017-01-01Total Haloacetic Acids (HAA5)Monitoring, Routine (IDSE)Back in compliance
2017-01-01NitrateMonitoring, RegularBack in compliance
2015-11-01Coliform (TCR)Monitoring, Routine Major (TCR)Back in compliance
2015-10-01ArsenicMonitoring, RegularBack in compliance
2015-01-01NitrateMonitoring, RegularBack in compliance
2014-11-01Coliform (TCR)Monitoring, Routine Major (TCR)Back in compliance
2011-01-01Combined Radium (-226 and -228)Monitoring, RegularBack in compliance
2011-01-01Gross Alpha, Excl. Radon and UMonitoring, RegularBack in compliance
2009-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
2005-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
2002-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
2001-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
2000-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance

System details

Population served	1,350
Service connections	352
Water source	Groundwater
System type	Community Water System
Owner	Private
Status	Active
City	Thermal
EPA ZIP on file	92274

Areas served

Reading this record

Oasis Mobile Home Park is a community water system that draws from groundwater and serves about 1,350 people in Thermal, 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.