Lead Service Line Inventory and Your CCR

The federal Lead and Copper Rule Revisions required every community water system to complete a service line inventory by October 16, 2024 — and now your annual Consumer Confidence Report must tell customers where to find it. Here is what the inventory covers, how the four classification categories work, and exactly what your CCR must say.

What is a service line, and why does it matter

A service line is the pipe connecting the water main in the street to the meter or building inlet. In older systems, those pipes are sometimes made of lead. Lead has no safe level of exposure in drinking water — the Maximum Contaminant Level Goal (MCLG) for lead is zero — and service lines are among the most direct routes lead takes into tap water, especially in homes with young children or pregnant residents.

The service line sits at the boundary between the utility's distribution system and privately owned plumbing. That boundary creates both a detection problem (utilities often lack records on customer-side materials) and a remediation problem (replacement may require coordination with property owners). The LCRR and subsequent Lead and Copper Rule Improvements (LCRI) address both by mandating a formal, public, classified inventory for every system.

For a deeper look at lead health effects and how they appear in the CCR, see Lead and Your CCR.

The LCRR initial inventory (October 16, 2024)

Under the Lead and Copper Rule Revisions (LCRR), finalized in 2021, every community water system was required to complete an initial service line inventory and submit it to the state primacy agency by October 16, 2024 (40 CFR § 141.84). That deadline has already passed.

The inventory must account for every service line in the distribution system — both the utility-owned portion (from the main to the meter) and the customer-owned portion (from the meter to the building), to the extent the system has records or can reasonably determine material. Systems were expected to use existing records, visual inspections, material inference from installation year and jurisdiction, and customer-provided information to build the initial inventory.

If your system has not yet completed its inventory, you are already past the regulatory deadline and should contact your state primacy agency immediately. The LCRI, finalized October 8, 2024 and published in the Federal Register on October 30, 2024 (89 FR 86416), preserves this deadline and builds further requirements on top of it.

For a detailed explanation of how the LCRR and LCRI relate to each other and to your 2027 compliance obligations, see LCR vs. LCRR vs. LCRI.

How to classify service lines

The LCRR establishes four and only four classification categories for service lines (40 CFR § 141.84). Every service line in your inventory must be assigned to one:

Lead. The service line is constructed of lead, as defined in 40 CFR § 141.2. This includes both utility-owned and customer-owned lead lines. A service line is classified as lead if records, physical inspection, or other evidence-based methods confirm lead material.

Galvanized requiring replacement (GRR). Galvanized steel or iron pipe that is or was downstream of a lead service line at any point in its service history. Galvanized pipe can accumulate lead particles shed from upstream lead lines, so it carries a similar replacement obligation even after the lead line upstream is removed.

Non-lead. The service line material is confirmed as copper, plastic, ductile iron, or another non-lead material through records, physical inspection, or evidence-based inference. The standard for "non-lead" is affirmative confirmation, not absence of a lead record.

Lead status unknown. The material is not positively confirmed as lead, GRR, or non-lead. This is the residual category — service lines for which records are insufficient and no field verification has been done. Systems must have a plan to resolve unknown-status lines over time.

The categories matter for two reasons: (1) lead and GRR lines trigger the mandatory replacement schedule under LCRI; (2) any system with lead, GRR, or unknown-status lines triggers additional CCR disclosure obligations described in the next section.

Public-accessibility requirements

The inventory must be publicly accessible (40 CFR § 141.84(b)). At minimum, systems must make the inventory available upon customer request. Systems serving 50,000 or more persons must post it on a publicly accessible website.

Public accessibility means more than filing the inventory with the state. Customers need a way to find out whether their specific service line is classified as lead, GRR, or unknown — and many state primacy agencies are moving toward address-searchable online portals as the practical standard, even for smaller systems.

The inventory must be kept current. As systems replace service lines or complete material verifications on unknown-status lines, the inventory must be updated to reflect the change. A static document submitted once and never revised does not satisfy the ongoing obligations.

What the CCR must disclose

Starting with the report covering calendar year 2024 data (due July 1, 2025 for most systems), your Consumer Confidence Report must include specific service line inventory content under 40 CFR § 141.153(h)(8).

All systems must include a statement confirming that a service line inventory has been prepared, along with instructions for how customers can access the publicly accessible inventory. This applies even if your system has zero lead, GRR, or unknown service lines — in that case, the inventory statement may consist of a written declaration that no such lines exist in the system.

Systems with any lead, GRR, or unknown-status service lines must go further. Under § 141.153(h)(8)(iii), those systems must also provide customers with either:

The practical implication: if even one service line in your system remains classified as lead, GRR, or unknown, you cannot satisfy the CCR disclosure with a single sentence. You must direct customers to both the inventory and the replacement plan.

The CCR disclosure requirement is separate from the inventory submission requirement. Submitting the inventory to your state primacy agency does not automatically generate compliant CCR language. The CCR language must appear in the annual report delivered to customers, citing where they can find the inventory.

For the full set of 2024 CCR rule changes affecting your 2027-compliant reports, see 2027 Rule Changes. For everything the LCRI changes in your next reporting cycle, see LCRI 2027.

LCRI: faster replacement, lower action level (Nov 1, 2027)

The LCRI, which has a full compliance date of November 1, 2027 (40 CFR § 141.152(a); 89 FR 86416), makes two significant additions to the service line framework.

Mandatory 10-year replacement schedule. Every community water system with lead or GRR service lines must complete full replacement within 10 program years of the LCRI compliance date (40 CFR § 141.84). The default pace is an average annual replacement rate of at least 10 percent of remaining lead and GRR lines, calculated cumulatively. The first cumulative assessment happens at the end of the third program year; annual assessments follow. Systems that can show a smaller inventory may qualify for a shortened deadline; systems facing documented feasibility constraints may petition for an extension, subject to state approval.

The replacement obligation covers service lines under the system's control. For lines on private property, systems must make good-faith efforts and have a process for coordinating with property owners, but the regulation does not require systems to trespass or force entry to replace customer-owned lines.

Lower action level. Beginning November 1, 2027, the lead action level drops from 15 µg/L to 10 µg/L (40 CFR § 141.80; LCRI, 89 FR 86416). Exceedance of the action level — based on paired first-and-fifth-liter tap samples, using the higher of the two values, at 90th-percentile sites — triggers enhanced corrosion control treatment and accelerated public notification requirements. The lower threshold means some systems currently below the old action level will exceed the new one, triggering obligations that did not apply before.

The combination of a mandatory replacement timeline and a lower action level means that service line inventory accuracy is now directly tied to regulatory compliance risk. A system that classifies a lead line as "non-lead" or leaves it in the "unknown" category without active resolution will face both a compliance gap and a public health exposure that should have been disclosed.

For a full treatment of the LCRI changes to lead sampling and action level thresholds, see LCRI 2027.

What consumers can do

If you receive a CCR that mentions a service line inventory, here is what to do with that information.

Find your line. The CCR is required to tell you how to access the inventory. Most systems will provide a website address, a phone number, or a mailing address. Look up your specific property address. Your line may be classified as lead, GRR, non-lead, or unknown.

If your line is lead or GRR. Your utility is now legally required to replace it within 10 years under the LCRI replacement schedule. You can ask the utility where your address falls in the replacement queue. In the meantime, you can reduce exposure by running your tap for 30 seconds to 2 minutes before using water for drinking or cooking, especially after water has been sitting unused for several hours.

If your line is "lead status unknown." Your utility should be working to verify the material. You can ask the utility when your address is scheduled for material verification or physical inspection. Until the line is confirmed as non-lead, treat it as potentially lead for drinking water purposes.

If your CCR says the inventory confirms no lead, GRR, or unknown lines. Your system has classified all service lines as non-lead. The CCR must still confirm that an inventory was prepared and is accessible. You can request a copy or check online to confirm your specific address.

Request your water's lead test results. The CCR reports lead levels as a 90th-percentile result across the system's sampling sites — not a result specific to your home. If you want a result for your tap, contact your utility or your state health department about tap sampling assistance programs, many of which are free for households with young children or pregnant residents.

Last reviewed: 2026-05-03. Next scheduled review: every 6 months or after LCRI implementation milestones.