PlainEnviro

TWIN LAKES RESORT

PWSID: CA3701793 · La Mesa, CA · Serves 400 people

According to EPA Safe Drinking Water Information System (SDWIS), TWIN LAKES RESORT (PWSID CA3701793) in La Mesa, CA is listed as a CWS water system covering about 400 people. The same extract lists 73 health-based violation records spanning 2016-2025. Those 73 health-based rows for TWIN LAKES RESORT cover contaminants such as Arsenic; they remain historical EPA registry entries, not a current compliance or drinkability score.

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Health-Based Records

TWIN LAKES RESORT has 73 health-based violation records in this historical extract. Monitoring and reporting records are not included.

Population Served
400
Health-Based Violation Records
73
Distinct Contaminant Codes
1
Source Type
Groundwater

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. 1 distinct EPA contaminant code appears in this system's record, including Arsenic. Recorded violations span 2016–2025. 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)
CA3701793
System Type
CWS
Water Source
Groundwater
Location
La Mesa, CA
Population Served
400
Health Violations
Yes (73)

What contaminants are in this water system?

Contaminant Violations Health-Based
Arsenic 73 73

Violation History (73)

Contaminant Health Date
Arsenic Yes Apr 1, 2025
Arsenic Yes Apr 1, 2025
Arsenic Yes Jan 1, 2025
Arsenic Yes Jan 1, 2025
Arsenic Yes Oct 1, 2024
Arsenic Yes Oct 1, 2024
Arsenic Yes Oct 1, 2024
Arsenic Yes Jul 1, 2024
Arsenic Yes Jul 1, 2024
Arsenic Yes Apr 1, 2024
Arsenic Yes Apr 1, 2024
Arsenic Yes Jan 1, 2024
Arsenic Yes Jan 1, 2024
Arsenic Yes Oct 1, 2023
Arsenic Yes Oct 1, 2023
Arsenic Yes Oct 1, 2023
Arsenic Yes Oct 1, 2023
Arsenic Yes Jul 1, 2023
Arsenic Yes Jul 1, 2023
Arsenic Yes Jul 1, 2023
Arsenic Yes Jul 1, 2023
Arsenic Yes Jan 1, 2023
Arsenic Yes Jan 1, 2023
Arsenic Yes Jan 1, 2023
Arsenic Yes Jan 1, 2023
Arsenic Yes Oct 1, 2022
Arsenic Yes Oct 1, 2022
Arsenic Yes Jul 1, 2022
Arsenic Yes Jul 1, 2022
Arsenic Yes Apr 1, 2022
Arsenic Yes Apr 1, 2022
Arsenic Yes Jan 1, 2022
Arsenic Yes Jan 1, 2022
Arsenic Yes Jul 1, 2021
Arsenic Yes Jul 1, 2021
Arsenic Yes Apr 1, 2021
Arsenic Yes Apr 1, 2021
Arsenic Yes Apr 1, 2021
Arsenic Yes Jan 1, 2021
Arsenic Yes Jan 1, 2021
Arsenic Yes Jul 1, 2020
Arsenic Yes Jul 1, 2020
Arsenic Yes Apr 1, 2020
Arsenic Yes Apr 1, 2020
Arsenic Yes Jan 1, 2020
Arsenic Yes Jan 1, 2020
Arsenic Yes Jul 1, 2019
Arsenic Yes Jul 1, 2019
Arsenic Yes Apr 1, 2019
Arsenic Yes Apr 1, 2019
Arsenic Yes Jan 1, 2019
Arsenic Yes Jan 1, 2019
Arsenic Yes Oct 1, 2018
Arsenic Yes Oct 1, 2018
Arsenic Yes Apr 1, 2018
Arsenic Yes Apr 1, 2018
Arsenic Yes Jan 1, 2018
Arsenic Yes Jan 1, 2018
Arsenic Yes Jan 1, 2018
Arsenic Yes Oct 1, 2017
Arsenic Yes Oct 1, 2017
Arsenic Yes Jul 1, 2017
Arsenic Yes Jul 1, 2017
Arsenic Yes Apr 1, 2017
Arsenic Yes Apr 1, 2017
Arsenic Yes Jan 1, 2017
Arsenic Yes Jan 1, 2017
Arsenic Yes Oct 1, 2016
Arsenic Yes Oct 1, 2016
Arsenic Yes Jul 1, 2016
Arsenic Yes Jul 1, 2016
Arsenic Yes Apr 1, 2016
Arsenic Yes Apr 1, 2016

Frequently Asked Questions

What does EPA SDWIS list for TWIN LAKES RESORT?
TWIN LAKES RESORT has 73 health-based violation records in this historical extract. Monitoring and reporting records are not included. The system uses groundwater water as its source.
How many people does TWIN LAKES RESORT serve?
TWIN LAKES RESORT serves 400 people in La Mesa, CA. It is classified as a CWS water system.
What violations does TWIN LAKES RESORT have?
TWIN LAKES RESORT has 73 health-based violation records in PlainEnviro's extract spanning 2016–2025. Monitoring and reporting records are not included.
What contaminants have been found in TWIN LAKES RESORT water?
Violations have been recorded for 1 contaminant. The most frequent: Arsenic.

Compare beyond California

Nationwide peers by violations & population served

Cross-state SDWIS systems nearest TWIN LAKES RESORT on cumulative violation count (73) and EPA-reported population served (400). Violation-count peers include HUMPHREY WATERWORKS, NOWATA MUNICIPAL AUTHORITY, SCUA Upper Seven Mile.

Similar violation count

Nearest cross-state community systems (500+ served) by SDWIS violations on record.

Nearby Water Systems

SAN DIEGO, CITY OF
San Diego · 1,385,379 served
Clean
HELIX WATER DISTRICT
La Mesa · 277,668 served
Clean
OTAY WATER DISTRICT
Spring Valley · 238,008 served
Clean
SWEETWATER AUTHORITY
Chula Vista · 191,282 served
Clean
OCEANSIDE, CITY OF
Oceanside · 171,483 served
Clean
ESCONDIDO, CITY OF
Escondido · 137,044 served
Clean
VISTA IRRIGATION DISTRICT
Vista · 132,430 served
Clean
VALLECITOS WD
San Marcos · 113,500 served
Clean
CAL-AM WATER CORONADO
Imperial Beach · 106,000 served
2 viol.
CARLSBAD MWD
Carlsbad · 95,158 served
Clean
OLIVENHAIN MWD
Encinitas · 86,458 served
Clean
CITY OF SAN CLEMENTE
San Clemente · 51,545 served
Clean

Explore More

California Water Systems → All States → Contaminants →

About This Data

TWIN LAKES RESORT (CA3701793) is drawn from EPA SDWIS. Nearby county systems in this extract include SAN DIEGO, CITY OF; HELIX WATER DISTRICT; OTAY WATER DISTRICT; SWEETWATER AUTHORITY. Health-based rows (73 MCL/TT) are historical registry state, 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.

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