Water Infrastructure Risk by ZIP Code
Check your ZIP code's water infrastructure risk. Pipe failure probability based on EPA funding gaps, housing age, violation history, and lead indicators.
- Composite pipe failure probability score for your ZIP code
- Breakdown of four risk factors: funding gap, housing vintage, violations, lead indicators
- Personalized recommendations based on your risk level
What This Tool Measures
This tool estimates your ZIP code's pipe failure probability (0–100%) by combining four independently-verified data sources into a composite infrastructure risk score.
| Risk Factor | Weight | Data Source |
|---|---|---|
| State Funding Gap | 25% | EPA DWINS 2023 — $625B national need over 20 years |
| Housing Vintage | 25% | Census ACS — % pre-1980 housing stock |
| Violations & Enforcement | 25% | EPA SDWIS — Safe Drinking Water Act violations |
| Lead Indicators | 25% | LCRI inventories + 90th percentile lead testing |
How to Interpret Your Score
| Probability | Risk Level | What It Means |
|---|---|---|
| 0–20% | Low | Newer infrastructure, well-funded state, few violations |
| 21–35% | Low-Moderate | Some aging components, but generally maintained |
| 36–50% | Moderate | Notable aging infrastructure — periodic testing recommended |
| 51–70% | High | Multiple risk factors — annual water testing recommended |
| 71–100% | Very High | Significant infrastructure concerns — test water and consider filtration |
Each of the four risk factors is normalized to a 0.0–1.0 scale and weighted equally (25%). The composite score is their weighted sum, expressed as a percentage.
State Funding Gap: EPA's 7th DWINS identified $625 billion in national infrastructure needs over 20 years. Each state's pipe-specific need per capita is normalized against the highest-need state.
Housing Vintage: Census ACS data provides the percentage of homes built before 1986 (lead solder ban year) and before 1950 (cast iron / lead service line era). Pre-1950 homes receive higher weight (40%) due to greater pipe failure risk.
Violations: EPA SDWIS health violations and enforcement actions are normalized with caps at the 95th percentile to prevent outlier distortion. Active issues and boil water advisories receive additional weight.
Lead Indicators: Combines lead service line inventory data (required under 2024 LCRI) with 90th percentile lead testing results, scored 0–100.
Why Infrastructure Age Matters
The American Society of Civil Engineers gave U.S. drinking water infrastructure a C-minus grade in their 2021 Report Card. An estimated 6 billion gallons of treated water are lost daily through approximately 240,000 water main breaks per year.
Aging pipes don't just break — they leach contaminants. Lead service lines (pre-1950), lead solder joints (pre-1986), and corroding galvanized steel pipes can all introduce harmful metals into your drinking water, even if the water leaving the treatment plant is clean.
What You Can Do
- Test your water — Home testing kits ($20–50) or certified lab tests ($100–300) can detect lead, copper, and other contaminants that aging pipes may introduce
- Check your service line — Contact your water utility to learn if you have a lead service line. The 2024 LCRI rule requires utilities to inventory and replace lead lines within 10 years
- Read your CCR — Every water system publishes an annual Consumer Confidence Report detailing violations and test results
- Consider filtration — NSF/ANSI 53 certified filters remove lead and other contaminants. Reverse osmosis systems provide the most comprehensive protection
Data Sources
- EPA DWINS 2023 — 7th Drinking Water Infrastructure Needs Survey
- Census ACS — Housing characteristics (year built)
- EPA SDWIS — Violations and enforcement actions
- EPA LCRR — Lead and Copper Rule service line data
Infrastructure risk data is available for 38,549 ZIP codes across all 50 states and the District of Columbia. See the national rankings for the highest-risk areas.
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What This Score Means for Your Home
Your infrastructure risk score reflects the likelihood of water contamination from aging pipes, water main breaks, or treatment system failures in your area. It combines data on system age, EPA violation history, state funding gaps, and pipe material records from lead service line inventories. A high score does not mean your tap water is unsafe right now — it means your area's water infrastructure is older or more violation-prone than the national average, which increases the chance of future problems. To protect your household: test your water through a certified lab ($100–300), install an NSF/ANSI 53 certified filter if contaminants are detected, and read your utility's annual Consumer Confidence Report (CCR) for the latest test results and violation disclosures.
What Is Infrastructure Risk?
Infrastructure risk measures the probability that aging or underfunded water delivery systems will introduce contaminants into your tap water. It is not a water quality test — it is a structural assessment of the pipes, treatment plants, and distribution networks that carry water from the source to your faucet. The score combines four independently verified factors: how much your state underfunds pipe replacement relative to EPA-identified needs, the percentage of housing stock built before modern plumbing codes, the number of Safe Drinking Water Act violations on record, and lead service line inventory data required under the 2024 LCRI rule.
A high infrastructure risk score does not mean your water is contaminated today. It means the systems delivering your water are statistically more likely to fail, leak, or leach contaminants than the national average. The EPA estimates that the U.S. needs $625 billion in drinking water infrastructure investment over the next 20 years, and approximately 240,000 water main breaks occur annually (ASCE, 2021).
Understanding Pipe Materials
The material of your water service line and interior plumbing directly affects contamination risk. Older materials are more likely to leach metals or harbor bacteria as they corrode. The table below summarizes the most common pipe materials found in U.S. water systems, their typical installation era, and the associated health risk.
| Material | Era | Risk Level | Key Concern |
|---|---|---|---|
| Lead | Pre-1986 | High | Leaches lead into water, especially when water sits in pipes overnight |
| Galvanized Steel | 1920s–1960s | Moderate-High | Zinc coating erodes over time, trapping lead and iron sediment |
| Copper | 1960s+ | Low-Moderate | Generally safe; pre-1986 joints may use lead solder |
| PVC / CPVC | 1970s+ | Low | No metal leaching; early formulations may contain vinyl chloride |
| PEX | 2000s+ | Lowest | Flexible cross-linked polyethylene; no corrosion or metal leaching |
The EPA estimates 9.2 million lead service lines remain in use across the United States. If your home was built before 1986, your plumbing may contain lead solder even if the pipes themselves are copper.
EPA Lead & Copper Rule Improvements (LCRI)
In October 2024, the EPA finalized the Lead and Copper Rule Improvements (LCRI), the most significant update to lead-in-water regulation since the original 1991 rule. The LCRI requires all public water systems to complete a comprehensive inventory of lead service lines and submit the results to their state primacy agency. Systems that identify lead service lines must replace them within 10 years — no partial replacements or "test-out" provisions are allowed.
The rule also lowered the lead action level from 15 ppb to 10 ppb and introduced a new trigger level at 15 ppb that requires corrosion control optimization. The Bipartisan Infrastructure Law (2021) allocated $15 billion through the Drinking Water State Revolving Fund (DWSRF) specifically for lead service line replacement, with 49% designated as grants or principal forgiveness for disadvantaged communities. Water systems serving communities above the action level must notify affected residents within 24 hours and provide filters certified to remove lead.
Frequently Asked Questions
How old is the average water infrastructure in the US?
Much of America's drinking water infrastructure is 50 to 100 years old. The American Society of Civil Engineers estimates that some pipes still in service were installed in the late 1800s. The EPA's 2023 Drinking Water Infrastructure Needs Survey identified $625 billion in necessary upgrades over the next 20 years to maintain safe drinking water delivery.
What are the signs of aging water infrastructure?
Common signs include discolored or rusty water (brown, yellow, or orange tint), low water pressure, frequent water main breaks in your neighborhood, and sediment in your water. You may also notice a metallic taste. Your water utility's annual Consumer Confidence Report (CCR) can reveal whether your system has had recent violations related to infrastructure issues.
How does pipe age affect water quality?
Aging pipes can leach contaminants into otherwise clean water. Lead service lines (common before 1950) and lead solder joints (used until 1986) release lead into drinking water, especially when water sits in pipes overnight. Corroding iron and galvanized steel pipes can introduce rust, sediment, and create conditions that harbor bacteria. The EPA estimates 9.2 million lead service lines remain in use nationwide.
What is the Lead and Copper Rule?
The Lead and Copper Rule (LCR) is an EPA regulation first established in 1991 that requires water systems to monitor lead and copper levels at customer taps. The 2024 Lead and Copper Rule Improvements (LCRI) strengthened the rule by requiring utilities to inventory and replace all lead service lines within 10 years and lowered the lead action level from 15 ppb to 10 ppb.
How much does it cost to replace water infrastructure?
Replacing a single lead service line costs between $5,000 and $15,000 depending on length and local conditions. At a national scale, the EPA estimates $625 billion is needed over 20 years for drinking water infrastructure. The Bipartisan Infrastructure Law (2021) allocated $15 billion specifically for lead service line replacement and $11.7 billion for general drinking water infrastructure improvements.
Data Sources & Methodology
Data Sources
- EPA DWINS 2023 — 7th Drinking Water Infrastructure Needs Survey — $625B national need over 20 years
- Census ACS — Housing year built distribution — pre-1980 and pre-1950 stock by ZIP
- EPA SDWIS — Health violations and enforcement actions
- EPA LCRI — Lead service line inventory data and 90th percentile lead testing
Methodology
Four risk factors are each normalized to 0.0–1.0 and weighted equally (25%): state funding gap per capita, pre-1980 housing percentage, EPA health violations count (capped at 95th percentile), and lead indicator score. The composite score is expressed as a percentage representing pipe failure probability.