Public water system record

Oasis Mobile Home Park

Serves Oasis, Riverside County, CA · 1,350 people served

Federal records show 17 health-based violations and 168 monitoring/reporting issues for Oasis Mobile Home Park in the last ten years, including an unresolved Groundwater Rule violation.

  • 090605129
  • THERMAL
  • CA
  • 1,350 served

System profile

Source water Groundwater
ZIP 92274
EPA system ID 090605129

Verify this system on EPA ECHO →

Health-based violations, last 10 years
17
Resolved
15
Unresolved
2
Any acute record
No
Monitoring issues, last 10 years
168

Key facts

  • Oasis Mobile Home Park draws water from 1 well.
  • Highest measured level in the last 10 years: Arsenic, 0.0855 mg/L, federal limit 0.01 mg/L (8.6 times the limit), 2021.
  • Most recent formal enforcement: emergency order under section 1431 of the Safe Drinking Water Act by EPA, September 2021.
  • Record on file since 1996, with 19 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 216 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Arsenic
Contaminant limit exceeded
Measured 0.024 mg/L, federal limit 0.01 mg/L (2.4 times the limit)
330 Oct 1, 2022 Resolved No
Arsenic
Contaminant limit exceeded
Measured 0.0444 mg/L, federal limit 0.01 mg/L (4.4 times the limit)
330 Jul 1, 2022 Resolved No
Arsenic
Contaminant limit exceeded
Measured 0.0627 mg/L, federal limit 0.01 mg/L (6.3 times the limit)
330 Apr 1, 2022 Resolved No
Arsenic
Contaminant limit exceeded
Measured 0.0765 mg/L, federal limit 0.01 mg/L (7.7 times the limit)
330 Jan 1, 2022 Resolved No
Arsenic
Contaminant limit exceeded
Measured 0.0817 mg/L, federal limit 0.01 mg/L (8.2 times the limit)
330 Oct 1, 2021 Resolved No
Arsenic
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.01 mg/L (8.1 times the limit)
330 Jul 1, 2021 Resolved No
Arsenic
Contaminant limit exceeded
Measured 0.0821 mg/L, federal limit 0.01 mg/L (8.2 times the limit)
330 Apr 1, 2021 Resolved No
Groundwater Rule
Treatment technique failure
140 Mar 31, 2021 Active No
Groundwater Rule
Treatment technique failure
140 Mar 31, 2021 Resolved No
Groundwater Rule
Treatment technique failure
140 Mar 31, 2021 Active No
Arsenic
Contaminant limit exceeded
Measured 0.0855 mg/L, federal limit 0.01 mg/L (8.6 times the limit)
330 Jan 1, 2021 Resolved No
Arsenic
Contaminant limit exceeded
Measured 0.0844 mg/L, federal limit 0.01 mg/L (8.4 times the limit)
330 Oct 1, 2020 Resolved No
Arsenic
Contaminant limit exceeded
Measured 0.0835 mg/L, federal limit 0.01 mg/L (8.4 times the limit)
330 Jul 1, 2020 Resolved No
Arsenic
Contaminant limit exceeded
Measured 0.0203 mg/L, federal limit 0.01 mg/L (2 times the limit)
330 Jan 1, 2020 Resolved No
Arsenic
Contaminant limit exceeded
Measured 0.0203 mg/L, federal limit 0.01 mg/L (2 times the limit)
330 Oct 1, 2019 Resolved No
Arsenic
Contaminant limit exceeded
Measured 0.0267 mg/L, federal limit 0.01 mg/L (2.7 times the limit)
330 Jul 1, 2019 Resolved No
Arsenic
Contaminant limit exceeded
Measured 0.0221 mg/L, federal limit 0.01 mg/L (2.2 times the limit)
330 Apr 1, 2019 Resolved No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Revised Total Coliform Rule
RPT
May 1, 2024 Resolved
Revised Total Coliform Rule
RPT
Feb 1, 2024 Resolved
Revised Total Coliform Rule
RPT
Jun 1, 2023 Resolved
Revised Total Coliform Rule
RPT
Apr 1, 2023 Resolved
Chlorine
Monitoring and reporting
Apr 1, 2023 Resolved
Public Notice
OTHER
Apr 1, 2022 Resolved
Public Notice
OTHER
Jan 1, 2022 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
Jan 1, 2022 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
Jan 1, 2022 Resolved
Styrene
Monitoring and reporting
Jan 1, 2022 Resolved
Ethylbenzene
Monitoring and reporting
Jan 1, 2022 Resolved
Toluene
Monitoring and reporting
Jan 1, 2022 Resolved
Benzene
Monitoring and reporting
Jan 1, 2022 Resolved
CHLOROBENZENE
Monitoring and reporting
Jan 1, 2022 Resolved
Tetrachloroethylene
Monitoring and reporting
Jan 1, 2022 Resolved
1,1,2-Trichloroethane
Monitoring and reporting
Jan 1, 2022 Resolved
Trichloroethylene
Monitoring and reporting
Jan 1, 2022 Resolved
1,2-Dichloropropane
Monitoring and reporting
Jan 1, 2022 Resolved
Carbon tetrachloride
Monitoring and reporting
Jan 1, 2022 Resolved
1,1,1-Trichloroethane
Monitoring and reporting
Jan 1, 2022 Resolved
1,2-Dichloroethane
Monitoring and reporting
Jan 1, 2022 Resolved
trans-1,2-Dichloroethylene
Monitoring and reporting
Jan 1, 2022 Resolved
1,1-Dichloroethylene
Monitoring and reporting
Jan 1, 2022 Resolved
Vinyl chloride
Monitoring and reporting
Jan 1, 2022 Resolved
p-Dichlorobenzene
Monitoring and reporting
Jan 1, 2022 Resolved
o-Dichlorobenzene
Monitoring and reporting
Jan 1, 2022 Resolved
DICHLOROMETHANE
Monitoring and reporting
Jan 1, 2022 Resolved
Xylenes, Total
Monitoring and reporting
Jan 1, 2022 Resolved
cis-1,2-Dichloroethylene
Monitoring and reporting
Jan 1, 2022 Resolved
1,2,4-Trichlorobenzene
Monitoring and reporting
Jan 1, 2022 Resolved
Nitrate
Monitoring and reporting
Jan 1, 2022 Resolved
Revised Total Coliform Rule
RPT
Nov 1, 2021 Resolved
Public Notice
OTHER
Jul 1, 2021 Resolved
Chlorine
Monitoring and reporting
Jul 1, 2021 Resolved
Combined Radium (-226 and -228)
Monitoring and reporting
Jul 1, 2021 Resolved
Combined Uranium
Monitoring and reporting
Jul 1, 2021 Resolved
Gross Alpha, Excl. Radon and U
Monitoring and reporting
Jul 1, 2021 Resolved
ETHYLENE DIBROMIDE
Monitoring and reporting
Jul 1, 2021 Resolved
1,2-DIBROMO-3-CHLOROPROPANE
Monitoring and reporting
Jul 1, 2021 Resolved
Pentachlorophenol
Monitoring and reporting
Jul 1, 2021 Resolved
2,4,5-TP
Monitoring and reporting
Jul 1, 2021 Resolved
2,4-D
Monitoring and reporting
Jul 1, 2021 Resolved
2,3,7,8-TCDD
Monitoring and reporting
Jul 1, 2021 Resolved
Carbofuran
Monitoring and reporting
Jul 1, 2021 Resolved
Dinoseb
Monitoring and reporting
Jul 1, 2021 Resolved
Picloram
Monitoring and reporting
Jul 1, 2021 Resolved
OXAMYL
Monitoring and reporting
Jul 1, 2021 Resolved
Endothall
Monitoring and reporting
Jul 1, 2021 Resolved
Diquat
Monitoring and reporting
Jul 1, 2021 Resolved
Dalapon
Monitoring and reporting
Jul 1, 2021 Resolved
Nitrate
Monitoring and reporting
Jul 1, 2021 Resolved
Public Notice
OTHER
Apr 1, 2021 Resolved
Chlorine
Monitoring and reporting
Apr 1, 2021 Resolved
Combined Radium (-226 and -228)
Monitoring and reporting
Apr 1, 2021 Resolved
Gross Alpha, Excl. Radon and U
Monitoring and reporting
Apr 1, 2021 Resolved
2,3,7,8-TCDD
Monitoring and reporting
Apr 1, 2021 Resolved
Diquat
Monitoring and reporting
Apr 1, 2021 Resolved
Public Notice
OTHER
Mar 31, 2021 Resolved
Public Notice
OTHER
Mar 31, 2021 Resolved
Public Notice
OTHER
Mar 31, 2021 Resolved
Public Notice
OTHER
Jan 1, 2021 Resolved
Revised Total Coliform Rule
RPT
Nov 1, 2020 Resolved
Public Notice
OTHER
Oct 1, 2020 Resolved
Public Notice
OTHER
Oct 1, 2020 Resolved
Combined Radium (-226 and -228)
Monitoring and reporting
Oct 1, 2020 Resolved
Combined Uranium
Monitoring and reporting
Oct 1, 2020 Resolved
Gross Alpha, Excl. Radon and U
Monitoring and reporting
Oct 1, 2020 Resolved
Styrene
Monitoring and reporting
Oct 1, 2020 Resolved
Ethylbenzene
Monitoring and reporting
Oct 1, 2020 Resolved
Toluene
Monitoring and reporting
Oct 1, 2020 Resolved
Benzene
Monitoring and reporting
Oct 1, 2020 Resolved
CHLOROBENZENE
Monitoring and reporting
Oct 1, 2020 Resolved
Tetrachloroethylene
Monitoring and reporting
Oct 1, 2020 Resolved
1,1,2-Trichloroethane
Monitoring and reporting
Oct 1, 2020 Resolved
Trichloroethylene
Monitoring and reporting
Oct 1, 2020 Resolved
1,2-Dichloropropane
Monitoring and reporting
Oct 1, 2020 Resolved
Carbon tetrachloride
Monitoring and reporting
Oct 1, 2020 Resolved
1,1,1-Trichloroethane
Monitoring and reporting
Oct 1, 2020 Resolved
1,2-Dichloroethane
Monitoring and reporting
Oct 1, 2020 Resolved
trans-1,2-Dichloroethylene
Monitoring and reporting
Oct 1, 2020 Resolved
1,1-Dichloroethylene
Monitoring and reporting
Oct 1, 2020 Resolved
Vinyl chloride
Monitoring and reporting
Oct 1, 2020 Resolved
p-Dichlorobenzene
Monitoring and reporting
Oct 1, 2020 Resolved
o-Dichlorobenzene
Monitoring and reporting
Oct 1, 2020 Resolved
DICHLOROMETHANE
Monitoring and reporting
Oct 1, 2020 Resolved
Chlordane
Monitoring and reporting
Oct 1, 2020 Resolved
Xylenes, Total
Monitoring and reporting
Oct 1, 2020 Resolved
ETHYLENE DIBROMIDE
Monitoring and reporting
Oct 1, 2020 Resolved
1,2-DIBROMO-3-CHLOROPROPANE
Monitoring and reporting
Oct 1, 2020 Resolved
Total Polychlorinated Biphenyls (PCB)
Monitoring and reporting
Oct 1, 2020 Resolved
cis-1,2-Dichloroethylene
Monitoring and reporting
Oct 1, 2020 Resolved
1,2,4-Trichlorobenzene
Monitoring and reporting
Oct 1, 2020 Resolved
Pentachlorophenol
Monitoring and reporting
Oct 1, 2020 Resolved
Benzo(a)pyrene
Monitoring and reporting
Oct 1, 2020 Resolved
HEXACHLOROBENZENE
Monitoring and reporting
Oct 1, 2020 Resolved
2,4,5-TP
Monitoring and reporting
Oct 1, 2020 Resolved
2,4-D
Monitoring and reporting
Oct 1, 2020 Resolved
Heptachlor epoxide
Monitoring and reporting
Oct 1, 2020 Resolved
Heptachlor
Monitoring and reporting
Oct 1, 2020 Resolved
2,3,7,8-TCDD
Monitoring and reporting
Oct 1, 2020 Resolved
LASSO
Monitoring and reporting
Oct 1, 2020 Resolved
Atrazine
Monitoring and reporting
Oct 1, 2020 Resolved
Carbofuran
Monitoring and reporting
Oct 1, 2020 Resolved
Hexachlorocyclopentadiene
Monitoring and reporting
Oct 1, 2020 Resolved
Dinoseb
Monitoring and reporting
Oct 1, 2020 Resolved
Picloram
Monitoring and reporting
Oct 1, 2020 Resolved
Di(2-ethylhexyl) phthalate
Monitoring and reporting
Oct 1, 2020 Resolved
Simazine
Monitoring and reporting
Oct 1, 2020 Resolved
OXAMYL
Monitoring and reporting
Oct 1, 2020 Resolved
Di(2-ethylhexyl) adipate
Monitoring and reporting
Oct 1, 2020 Resolved
Glyphosate
Monitoring and reporting
Oct 1, 2020 Resolved
Endothall
Monitoring and reporting
Oct 1, 2020 Resolved
Diquat
Monitoring and reporting
Oct 1, 2020 Resolved
Dalapon
Monitoring and reporting
Oct 1, 2020 Resolved
Toxaphene
Monitoring and reporting
Oct 1, 2020 Resolved
Methoxychlor
Monitoring and reporting
Oct 1, 2020 Resolved
BHC-GAMMA
Monitoring and reporting
Oct 1, 2020 Resolved
Endrin
Monitoring and reporting
Oct 1, 2020 Resolved
Nitrite
Monitoring and reporting
Oct 1, 2020 Resolved
Nitrate
Monitoring and reporting
Oct 1, 2020 Resolved
Revised Total Coliform Rule
Monitoring violation
Apr 1, 2020 Resolved
Revised Total Coliform Rule
Monitoring violation
Mar 1, 2020 Resolved
Public Notice
OTHER
Feb 1, 2020 Resolved
Revised Total Coliform Rule
Monitoring violation
Feb 1, 2020 Resolved
Public Notice
OTHER
Jan 1, 2020 Resolved
Revised Total Coliform Rule
Monitoring violation
Jan 1, 2020 Resolved
Public Notice
OTHER
Nov 1, 2019 Resolved
Revised Total Coliform Rule
Monitoring violation
Nov 1, 2019 Resolved
Public Notice
OTHER
Oct 1, 2019 Resolved
Public Notice
OTHER
Oct 1, 2019 Resolved
Revised Total Coliform Rule
Monitoring violation
Oct 1, 2019 Resolved
Public Notice
OTHER
Aug 1, 2019 Resolved
Revised Total Coliform Rule
Monitoring violation
Aug 1, 2019 Resolved
Public Notice
OTHER
Jun 1, 2019 Resolved
Revised Total Coliform Rule
Monitoring violation
Jun 1, 2019 Resolved
Public Notice
OTHER
May 1, 2019 Resolved
Revised Total Coliform Rule
Monitoring violation
May 1, 2019 Resolved
Public Notice
OTHER
Apr 1, 2019 Resolved
Public Notice
OTHER
Apr 1, 2019 Resolved
Revised Total Coliform Rule
Monitoring violation
Apr 1, 2019 Resolved
Public Notice
OTHER
Mar 1, 2019 Resolved
Revised Total Coliform Rule
Monitoring violation
Mar 1, 2019 Resolved
Public Notice
OTHER
Feb 1, 2019 Resolved
Revised Total Coliform Rule
Monitoring violation
Feb 1, 2019 Resolved
Public Notice
OTHER
Jan 1, 2019 Resolved
Revised Total Coliform Rule
Monitoring violation
Jan 1, 2019 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
Jan 1, 2019 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
Jan 1, 2019 Resolved
Arsenic
Monitoring and reporting
Jan 1, 2019 Resolved
Public Notice
OTHER
Dec 1, 2018 Resolved
Revised Total Coliform Rule
Monitoring violation
Dec 1, 2018 Resolved
Public Notice
OTHER
Nov 1, 2018 Resolved
Revised Total Coliform Rule
Monitoring violation
Nov 1, 2018 Resolved
Public Notice
OTHER
Oct 1, 2018 Resolved
Revised Total Coliform Rule
Monitoring violation
Oct 1, 2018 Resolved
Arsenic
Monitoring and reporting
Oct 1, 2018 Resolved
Public Notice
OTHER
Sep 1, 2018 Resolved
Revised Total Coliform Rule
Monitoring violation
Sep 1, 2018 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
Jan 1, 2018 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
Jan 1, 2018 Resolved
Nitrate
Monitoring and reporting
Jan 1, 2018 Resolved
Arsenic
Monitoring and reporting
Jul 1, 2017 Resolved
Lead and Copper Rule
Monitoring and reporting
Jan 1, 2017 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
Jan 1, 2017 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
Jan 1, 2017 Resolved
Nitrate
Monitoring and reporting
Jan 1, 2017 Resolved
Combined Radium (-226 and -228)
Monitoring and reporting
Jan 1, 2011 Resolved
Gross Alpha, Excl. Radon and U
Monitoring and reporting
Jan 1, 2011 Resolved

Full record since 1996

EPA's records for Oasis Mobile Home Park go back to 1996. Before October 19, 2016 they list 19 health-based violations (19 resolved) and 163 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 1 7
2000s 14 149
2010 to October 18, 2016 4 7
October 19, 2016 to 2019 3 40
2020s 14 126

Most recent health-based violation before October 19, 2016: Arsenic, began October 2010, Resolved.

Show all 19 health-based violations before October 19, 2016
Contaminant Start date Status
Arsenic
Contaminant limit exceeded
Measured 0.01188 mg/L, federal limit 0.01 mg/L (1.2 times the limit)
Oct 1, 2010 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.01405 mg/L, federal limit 0.01 mg/L (1.4 times the limit)
Jul 1, 2010 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.01326 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
Apr 1, 2010 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.01283 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
Jan 1, 2010 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.0154 mg/L, federal limit 0.01 mg/L (1.5 times the limit)
Oct 1, 2009 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.016 mg/L, federal limit 0.01 mg/L (1.6 times the limit)
Jul 1, 2009 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.01453 mg/L, federal limit 0.01 mg/L (1.5 times the limit)
Apr 1, 2009 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.01384 mg/L, federal limit 0.01 mg/L (1.4 times the limit)
Jan 1, 2009 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.0124 mg/L, federal limit 0.01 mg/L (1.2 times the limit)
Oct 1, 2008 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.01255 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
Jul 1, 2008 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.01575 mg/L, federal limit 0.01 mg/L (1.6 times the limit)
Apr 1, 2008 Resolved
Total Coliform
Contaminant limit exceeded
Oct 1, 2007 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.0238 mg/L, federal limit 0.01 mg/L (2.4 times the limit)
Oct 1, 2007 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.017 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
Jul 1, 2007 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.0178 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
Apr 1, 2007 Resolved
Total Coliform
Contaminant limit exceeded
Sep 1, 2006 Resolved
Total Coliform
Contaminant limit exceeded
Aug 1, 2003 Resolved
Total Coliform
Contaminant limit exceeded
May 1, 2000 Resolved
Total Coliform
Contaminant limit exceeded
Sep 1, 1996 Resolved

Enforcement actions

EPA took 4 formal enforcement actions against Oasis Mobile Home Park between 2008 and 2021, filed as 23 records in EPA's data. The most recent was an emergency order under section 1431 of the Safe Drinking Water Act in September 2021.

Date By Action Violations covered
Sep 14, 2021 EPA Emergency order under section 1431 of the Safe Drinking Water Act 3 violations (3 health-based): Arsenic
Aug 27, 2020 EPA Emergency order under section 1431 of the Safe Drinking Water Act 11 violations (5 health-based): Arsenic, Public Notice
Aug 27, 2019 EPA Emergency order under section 1431 of the Safe Drinking Water Act 4 violations (3 health-based): Arsenic, Haloacetic Acids (HAA5)
Jan 22, 2008 EPA Signed compliance agreement 12 violations (12 health-based): Arsenic

What the violations mean

Arsenic

14 incidents

Arsenic exceeded the federal limit

Long-term arsenic exposure is linked to cancer and cardiovascular effects

Groundwater Rule

3 incidents

The system did not complete a treatment step or action that the Groundwater Rule requires (a treatment technique violation).

The utility had to notify customers about each of these violations.

Where the water comes from

Oasis Mobile Home Park draws water from 1 well.

Annual water quality report

Oasis Mobile Home Park must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by EPA Region 9.