Lead in Water in Marietta, IL: 0.0050 mg/L
Avg lead: 0.0050 mg/L · EPA limit: 0.015 mg/L · Updated 2026-05-03
Key fact: Lead contamination comes from YOUR HOME PIPES, not the treatment plant. Even safe water can pick up lead from older plumbing.
Data: EPA Lead and Copper Rule, U.S. Census Bureau (ACS) Last verified: 2026-05-03
Water sampling in Marietta under the Lead and Copper Rule yields an average of 0.0050 mg/L — a result that sits below the 0.015 mg/L mandatory notification and corrective-action threshold. City-wide averages, however, do not tell the household story. Pipe material, solder vintage, and service line condition vary property to property, meaning individual tap concentrations can diverge substantially from the community-wide figure in either direction.
Lead Risk Overview
The average 90th percentile lead level in Marietta, Illinois is 0.0050 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 Marietta:
| Factor | Value |
|---|---|
| Pre-1986 housing | 86% |
| Median build year | 1958 |
| Median household income | $51,250 |
| Population | 440 |
With over half of housing stock built before 1986, Marietta 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:
| Source | Data Point | Value |
|---|---|---|
| EPA Lead & Copper Rule | 90th percentile lead level | 0.0050 mg/L (within limit) |
| Consumer Confidence Report | Reported lead (90th %ile) | CCR data not available |
| CDC Blood Lead Surveillance | Children with BLL >= 5 ug/dL (Illinois, 2022) | 1.5% of tested children |
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. Marietta's water system is subject to these requirements.
Federal funding for Illinois:
| Metric | Value |
|---|---|
| FY2025 LSLR allotment | $309.6M |
| 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 Illinois.
To check if your home has a lead service line:
- Check your water utility's service line inventory (required to be publicly available)
- Inspect where the pipe enters your home — lead pipes are dull gray and can be scratched with a key
- Contact your water utility for a free service line inspection
Lead Risk by Housing Decade
The age of a home is one of the strongest predictors of lead risk in drinking water:
| Construction Era | Lead Risk Level | Key Concern |
|---|---|---|
| Before 1940 | Very High | Lead pipes, lead solder, lead paint |
| 1940–1959 | High | Lead solder common, some lead pipes |
| 1960–1978 | Moderate-High | Lead solder, lead paint (banned 1978) |
| 1979–1986 | Moderate | Lead solder still legal until 1986 |
| 1987–2013 | Low-Moderate | "Lead-free" = up to 8% lead in brass |
| 2014+ | Low | Reduction of Lead in Drinking Water Act (0.25% max) |
With a median build year of 1958, the typical home in Marietta falls in the high risk category for lead in plumbing. 86% of homes were built before the 1986 lead solder ban.
How to Test for Lead in Marietta
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
- Flush your pipes — run cold water for 2+ minutes before drinking, especially in the morning
- Use cold water for cooking and baby formula (hot water dissolves more lead)
- Install a certified filter — look for NSF/ANSI Standard 53 certification for lead removal
- Get your water tested — EPA-certified kits cost $20–$50
- Replace lead service lines — check with your utility about replacement programs
Most Affected Areas
The ZIP code with the highest lead levels in Marietta is 61459. 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 Marietta
Lead risk varies across Marietta's 1 ZIP codes based on housing age, water system, and testing results.
| ZIP Code | Grade | Score | Violations | |
|---|---|---|---|---|
| 61459 | C | 66/100 | 0 | View report → |