Data: EPA Lead and Copper Rule, U.S. Census Bureau (ACS) Last verified: 2026-05-03

0.0008 mg/L — the aggregated Lead and Copper Rule sampling figure for Lake Forest in EPA records. The corrective-action line sits at 0.015 mg/L; systems below that point are not required to initiate the formal investigation-and-remediation process an exceedance would trigger. Individual properties can still diverge, particularly those in housing constructed before lead solder was prohibited: the average describes a distribution network, not what flows from any given faucet.

Lead Risk Overview

The average 90th percentile lead level in Lake Forest, California is 0.0008 mg/L. The EPA action level is 0.015 mg/L (15 parts per billion). This is within the EPA action level, though the EPA states there is no safe level of lead exposure.

Housing Age and Lead Risk

Lead plumbing solder was banned in 1986. Homes built before this date may have lead in:

• Solder joints connecting copper pipes
• Lead service lines connecting the water main to the home
• Brass fixtures and faucets containing up to 8% lead (pre-2014)

In Lake Forest:

Factor	Value
Pre-1986 housing	68%
Median build year	1989
Median household income	$119,984
Population	51,980

With over half of housing stock built before 1986, Lake Forest has elevated risk of lead in residential plumbing. This is particularly concerning for homes built before 1978 (when lead paint was also banned) and before 1950 (when lead pipes were most common).

Health Effects of Lead Exposure

Lead exposure is a serious public health concern with no safe level identified by the CDC:

Children (under 6):

• Developmental delays and learning difficulties
• Reduced IQ and attention span
• Behavioral problems
• Slowed growth

Adults:

• Kidney damage
• High blood pressure
• Reproductive issues
• Nerve disorders

Pregnant women are especially at risk — lead crosses the placenta and affects fetal development.

Three-Source Lead Data Confirmation

Lead risk is best understood by combining multiple data sources:

Cross-referencing multiple sources provides a more complete picture of lead risk than any single dataset.

Lead Service Line Replacement (LSLR)

The EPA's revised Lead and Copper Rule (LCRR) requires all water systems to create a service line inventory by October 2024 and replace lead service lines within 10 years. Lake Forest's water systems are subject to these requirements.

Federal funding for California:

Metric	Value
FY2025 LSLR allotment	$28.6M
Additional subsidy	49% available as grants/forgiveness
National total	$3.0B

This funding is available through the Drinking Water State Revolving Fund (DWSRF) for lead service line inventory and replacement projects in California.

To check if your home has a lead service line:

1. Check your water utility's service line inventory (required to be publicly available)
2. Inspect where the pipe enters your home — lead pipes are dull gray and can be scratched with a key
3. Contact your water utility for a free service line inspection

Lead & Copper Rule Compliance Trend

EPA violations for water systems serving Lake Forest over time:

Over the 3-year period, Lake Forest has recorded 4 total violations (4 health-based).

Lead Risk by Housing Decade

The age of a home is one of the strongest predictors of lead risk in drinking water:

With a median build year of 1989, the typical home in Lake Forest falls in the low-moderate risk category for lead in plumbing. 68% of homes were built before the 1986 lead solder ban.

How to Test for Lead in Lake Forest

DIY Test Kits ($20–$50)

• Available at hardware stores and online
• Collect a "first-draw" sample (water sitting in pipes 6+ hours)
• Send to an EPA-certified lab for analysis
• Results typically in 1–2 weeks

Professional Lab Testing ($150–$400)

• Comprehensive panel: lead, copper, bacteria, nitrates, and more
• Certified technician collects samples
• Best for homes built before 1986 or after a plumbing change

Free Testing Options

• Many water utilities offer free lead testing — call your provider
• Some states offer free testing for homes with children under 6
• Check your annual Consumer Confidence Report (CCR) for system-wide results

What to Expect

• Below 0.005 mg/L (5 ppb): Low concern
• 0.005–0.015 mg/L (5–15 ppb): Consider filtration, especially with children
• Above 0.015 mg/L (15 ppb): Exceeds EPA action level — take immediate action
• Above 0.040 mg/L (40 ppb): Use bottled water while addressing the source

How to Reduce Lead Exposure

1. Flush your pipes — run cold water for 2+ minutes before drinking, especially in the morning
2. Use cold water for cooking and baby formula (hot water dissolves more lead)
3. Install a certified filter — look for NSF/ANSI Standard 53 certification for lead removal
4. Get your water tested — EPA-certified kits cost $20–$50
5. Replace lead service lines — check with your utility about replacement programs

Most Affected Areas

The ZIP code with the highest lead levels in Lake Forest is 92630. Check your specific ZIP code for detailed lead testing results.

Data Sources

• Lead levels: EPA Lead and Copper Rule sampling data
• Housing data: U.S. Census Bureau American Community Survey (ACS)
• Health information: CDC and EPA public health guidelines
• Blood lead surveillance: CDC Childhood Blood Lead Surveillance (CBLS)
• LSLR funding: EPA DWSRF Lead Service Line Replacement allotments

Updated daily.

Lead Risk by ZIP Code in Lake Forest

Lead risk varies across Lake Forest's 1 ZIP codes based on housing age, water system, and testing results.

ZIP Code	Grade	Score	Violations
92630	B	80/100	5	View report →

Low Lead Levels — Stay Protected

Lead levels in Lake Forest are well below the EPA action level. To maintain this:

• Run cold water for 30 seconds before drinking (especially in the morning)
• Replace faucet aerators every 6-12 months
• If renovating, use lead-free certified fixtures (NSF/ANSI 61)
• Test after any plumbing work