Loma Mar, CA Water Safety: 83/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
Based on current monitoring, Loma Mar holds an above-average drinking water safety record for CA — violations are infrequent and typically minor when they do appear.
How Loma Mar Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Loma Mar Residents
- Average lead level: 0.0028 mg/L.
- Homes built before 1986: 100% — older plumbing may contain lead solder.
- Estimated remediation: $1,600 per household.
- CDC health risk index: 9.58.
Loma Mar's Water Providers
At present, 2 utilities serve the bulk of Loma Mar, CA's residential water connections out of 2 systems active in the area, spread across independent providers with separate infrastructure and compliance obligations.
Overview
We track water quality and home safety data for 1 ZIP code in Loma Mar, California, covering 2 community water systems serving approximately 332 people.
No EPA violations recorded across any ZIP codes in Loma Mar — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Loma Mar: B (83/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Loma Mar water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0028 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 94021 | B | Redwood Glen Camp & Conference Ctr | 114 |
All ZIP Codes in Loma Mar
- 94021 [B]
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Loma Mar Community Health Snapshot
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Loma Mar Infrastructure Age
With 100% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Heavily weighted toward older construction, Loma Mar's housing stock carries a median build year of 1944. That profile puts a majority of homes in the era when lead-soldered copper plumbing was standard practice.
Over half of homes in Loma Mar were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
How Remediation Costs Compare in Loma Mar
What does remediation cost in financial context for Loma Mar homeowners? Proportionally very little — the equity share here is low, and addressing documented issues is a manageable planning question rather than a material financial burden.
Remediation costs in Loma Mar are relatively low compared to home values. The $800–$2,600 estimated range is a small fraction of median property value. Home values are 38% above the California average.
Loma Mar: Lead Risk & Vulnerable Populations
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Routinely in Loma Mar, where 100% of housing predates the solder ban and aggregate utility readings hover near the federal threshold, a faucet-level draw functions as a standard household step for families with small kids.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Loma Mar: Flood History & Water Damage Risk
Flood risk in Loma Mar occupies the middle ground: 3 NFIP claims and 100% of local ZIP codes within FEMA flood zones. At that level, the risk pathways connecting flooding to water quality — treatment system stress, well infiltration, distribution backflow — become relevant considerations during significant flood events, even if day-to-day water quality is unaffected by flood history.
Loma Mar has a moderate flood history with 3 FEMA claims averaging $3,127 per payout. 100% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$1,600</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Loma Mar, CA