Lead in Drinking Water: Service Lines, Filters, and the LCRI Rule

This hub is the editorial entry point to our coverage of lead in drinking water — from the federal regulatory framework that governs water systems to the point-of-use measures households can take while service line replacement proceeds.

How lead enters drinking water

Lead is rarely present at the source. Surface-water reservoirs and groundwater aquifers contain very little lead naturally. Lead enters drinking water through the conveyance and plumbing infrastructure: lead service lines (the pipe between the water main and the home), lead-containing solder used in copper plumbing before 1986, and brass fixtures with internal lead content above the 1986 (8%) and 2014 (0.25%) Safe Drinking Water Act thresholds.

The mechanism is corrosion. Water with low pH, low alkalinity, or insufficient orthophosphate corrosion inhibitor leaches lead from these surfaces into the water column. Hot water leaches more aggressively than cold. First-draw water (water that has sat in pipes overnight) contains higher lead concentrations than flushed water.

The Lead and Copper Rule Improvements (LCRI), 2024

The LCRI is the most significant federal lead-water rulemaking since the 1991 Lead and Copper Rule. Its core provisions:

Regulatory Alignment

LCRI 2024 — Key Provisions


  • EPAMandatory inventory of all service lines (lead, galvanized requiring replacement, non-lead) in each public water system, completed and submitted by October 16, 2024

  • EPA10-year replacement deadline for all lead and galvanized-requiring-replacement service lines (extensions available with EPA approval)

  • EPALowered Lead Action Level from 15 µg/L to 10 µg/L (90th-percentile sampling)

  • EPACustomer notification within 24 hours of any sample exceedance, in plain language

  • EPAMandatory replacement of the entire service line — not just the utility-owned portion — for any LSL identified, with utility responsibility for funding pathways

For a state-by-state audit of LSL inventory progress and replacement timelines, see our comprehensive audit.

What households can do now

While LSL replacement proceeds — a process that will take years even under the LCRI’s accelerated timeline — households served by lead service lines or with pre-1986 plumbing have three immediate protective options:

Methodology · The Three-Stage Protocol

Household Lead-in-Water Protocol

**Stage 1: Confirm.** Test water with an EPA-certified laboratory. State health departments maintain certified lab lists. The first-draw morning sample (water that has sat in pipes for at least 6 hours) is the diagnostic standard.

**Stage 2: Filter.** If lead is detected, install a point-of-use filter certified to **NSF/ANSI Standard 53** for lead reduction. Filter selection matters: pitcher filters, faucet-mount filters, and under-sink reverse-osmosis systems all carry NSF 53 certification. Whole-house filters generally do not, and are not recommended for lead.

**Stage 3: Flush.** Run the cold-water tap for 30 seconds to 2 minutes before drinking, particularly in the morning or after the water has sat in pipes for hours. This clears the standing water from the lead service line and resident plumbing.

These three steps reduce — but do not eliminate — exposure. Permanent reduction requires lead service line replacement.

⚠ What Does Not Work
Boiling does not remove lead. It concentrates it through evaporation. Standard refrigerator water filters (without NSF 53 certification) generally do not reduce lead. Bottled water is regulated under FDA, not EPA, and is not subject to the same lead testing protocols — it is not a verified safer alternative.

Disclosure rules

Under the 2024 LCRI, water systems must publish their service line inventories in a publicly accessible format. Most have done so via state health department portals or utility websites. Search for your address in your utility’s inventory; if your service line is identified as “lead” or “galvanized requiring replacement,” you are entitled to the protections — and the replacement priority — established under the rule.

References & Sources Consulted


  1. U.S. Environmental Protection Agency. Lead and Copper Rule Improvements. Final Rule, 89 FR 86416; October 30, 2024.

  2. American Water Works Association. Lead Service Line Inventory: Best Practices. AWWA Manual M67; 2024.

  3. NSF International. NSF/ANSI Standard 53: Drinking Water Treatment Units — Health Effects. 2024.

  4. U.S. Environmental Protection Agency. Lead Service Line Replacement: Best Practices Guide. Office of Ground Water and Drinking Water; 2023.