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Community Water System · PWS CA3700923

Lake Morena's Oak Shores MWC

Operator location Campo, California - 77% of 179 violations are health-based (upper-third health share (> 23%)); groundwater source; 670 served per SDWIS.

670
People served (this PWS) Smaller third of systems
179
EPA violations (this PWS) Upper third of systems
137
Health-based (this PWS) Upper third by health-based share
Untested
UCMR5 (this PWS) No UCMR5 result
Follow published updates (RSS)

Lake Morena's Oak Shores MWC standing, high SDWIS violation third

77% of 179 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 77% is upper-third health share (> 23%). Population rank #24,871 of 29,740 among systems serving 500+.

The verdict

Lake Morena's Oak Shores MWC sits in the upper third of the sitemap cohort by violation count (179), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (670; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 77% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.

#24,871 of 29,740
Population · /systems
#1,424 of 1,701
Population · CA
179
Total EPA violations on record
77%
Health-based (MCL / treatment failure)

Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.

F
Water Safety Score
12/100
Lake Morena's Oak Shores MWC

Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.

Health-based violations F
137
EPA SDWIS health-based violations on record (MCL, MRDL, treatment technique)
Monitoring & reporting violations F
42
Non-health SDWIS violations (monitoring, reporting, and other compliance)
PFAS contamination N/A
Not UCMR5-tested
Highest PFAS compound level detected in UCMR5 testing

System Details

System Type
Community
Owner Type
Private
Connections
201
County
San Diego
School/Daycare
No
MCL Violations
136
Monitoring Violations
28
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MCL 73 2015
Combined Uranium MCL 36 2015
Coliform (TCR) MCL 21 2005
Coliform (TCR) MR 20 2009
Nitrate-Nitrite MCL 6 2009
Consumer Confidence Rule Other 5 2006
Nitrate Other 2 2007
Public Notice Other 2 2007
Revised Total Coliform Rule MON 2 2024
Gross Alpha, Excl. Radon and U MR 2 1981
Nitrite MR 2 2002
Lead and Copper Rule MR 2 2002
LEAD AND COPPER RULE REVISIONS TT 1 2024
LEAD AND COPPER RULE REVISIONS RPT 1 2024

Violation Count vs. the National Corpus

Lake Morena's Oak Shores MWC has 179 recorded EPA violations, 84% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 16% carry more. 77% of this system's own violations are health-based (137 of 179), and it ranks #24,871 of 29,740 by population served among that same cohort.

EPA violations vs. the national water-system corpus

Public water systems serving 500+ people (EPA SDWIS)

179 Higher than most more violations than 84% of 29,740 water systems

the national water-system corpus, bucketed by value

Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source EPA SDWIS · 2026-05-15

How many violations vs. how serious, among peer systems

Lake Morena's Oak Shores MWC plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.

Violation volume vs. health-based share

30 public water systems (500+ people served), EPA SDWIS current release. 2×2 strategic matrix plotting 30 entities by Total violations (X) and Health-based share (Y), with a crosshair dividing the plot into four quadrants. Frequent and seriousRare but seriousFrequent, mostly paperworkClean record 0200400600 0%20%40%60%80%100% Total violations Health-based share Violation volume vs. health-based share Miccosukee Service Plaza-0, 0%Brazoria - Fort Bend Counties MUD 3-0, 0%Tanglewilde Thompson Place 600-2, 0%Center Water Co-5, 0%Montgomery Co RWD 12-7, 29%Spring Mills Elem School/Hvs-9, 0%Irvin Water District #6-11, 27%Great Bend Industrial Park-14, 0%Nooksack Valley Water Association-16, 31%Glen Park Village-19, 0%Camp Is-Sho-Da-22, 0%Kipling Oaks 1-25, 16%McLouth, City Of-29, 17%Hamilton-33, 0%Pine Valley Plantation-37, 24%Lake Gibson Estates-42, 2%Ticonderoga WD-47, 26%Town of Welaka-54, 0%Township of Blairstown Dpw-61, 0%McIntosh Water & Fire Pro Authority-71, 0%Sunset Ridge Water District-82, 15%South Deerfield Water Supply District-96, 16%Clarkdale Municipal Water System-114, 0%Orange Water Dept-136, 14%Mount Pleasant Water Sys #1-167, 11%Benson Culinary Improvement District-212, 1%Eureka Water Association-273, 0%City of Ballinger-372, 85%Conemaugh Twp Muni Auth-567, 1%Lake Morena's Oak Shores MWC-179, 77%
30 public water systems (500+ people served), EPA SDWIS current release.

Health-based violations on Lake Morena's Oak Shores MWC

137 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for CA3700923.

EPA SDWIS · PWS CA3700923 CA primacy agency

Sources: EPA SDWIS · California State Water Resources Control Board, Division of Drinking Water

Nationwide peers

179 violations · 670 served: nearest cross-state SDWIS matches.

Cross-state systems with comparable violation load

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

4 peers

Cross-state systems with smaller service footprints

Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).

4 peers

What to do with Lake Morena's Oak Shores MWC

Use this system's EPA-reported record as a starting filter, not a final verdict.

  • See how every tracked system in California compares on the same EPA violation measures. California systems
  • Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
  • Find and compare another public water system by name or PWSID. Search systems

EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.