Page last updated on January 14, 2026 at 2:01 pm
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What Is a Service Line Inventory?
A service line is the pipe that delivers drinking water from the public water supply (water main) in the street to a building. As part of the Environmental Protection Agency (EPA) lead and copper rule, water systems are required to develop and maintain a comprehensive service line inventory that identifies the material of both the utility owned and privately owned portions of each service line. The utility owned portion connects the water main to the meter, while the private side connects the meter to the residence or business.
The inventory must be kept up to date and used to prioritize the replacement of lead service lines (LSLs) and galvanized service lines requiring replacement.
Service Line Material Classifications (LCRI)
The lead and copper rule establishes specific service line material categories that are used nationwide to ensure consistency and clarity:
- Lead Service Line: A service line that is made of lead in whole or in part
- Galvanized Requiring Replacement (GRR): A galvanized service line that is or was ever downstream of a lead service line
- Non-Lead: A service line made entirely of approved non-lead materials, such as copper or plastic
- Lead Status Unknown: A service line for which the material has not yet been confirmed
Unknown service lines must be investigated and resolved over time using records review, inspections, and other verification methods.
Why the Inventory Matters
- Identifies known and potential lead service lines
- Supports compliance with federal and state drinking water regulations
- Helps prioritize full lead service line replacement
- Provides transparency and clear communication to customers
- Supports long-term capital planning and funding opportunities
Under the lead and copper rule, utilities must work toward the replacement of all lead service lines, regardless of whether sampling results exceed the lead action level.
For more information about the lead and copper rule, please visit the EPA lead and copper rule website.
Public Access, Mapping, and Notifications
The LCRI requires water utilities to make service line inventory information publicly accessible. This may include online maps, searchable databases, or other tools that allow customers to view the known or suspected material serving their property.
Customers with a lead service line, galvanized service line requiring replacement, or unknown service line will receive required notices describing potential health risks and steps that can be taken to reduce lead exposure.
What Customers Can Do
- Review available information about your service line material
- Allow inspections or provide information when requested
- Follow guidance on flushing or filter use, if applicable
- Stay informed about lead service line replacement programs
Frequently Asked Questions (FAQ)
What is a lead service line?
A lead service line is a pipe made partially or entirely of lead that connects a building to the public water main. Lead service lines were commonly installed prior to the mid-20th century.
Does having a lead service line mean my water is unsafe?
Not necessarily, but lead service lines can increase the risk of lead entering drinking water. The LCRI focuses on removing this risk by requiring full replacement of lead service lines over time.
What does “galvanized requiring replacement” mean?
Galvanized requiring replacement (GRR) refers to galvanized steel pipes that are or were connected downstream of a lead service line. These pipes can accumulate lead and must also be replaced under the LCRI.
Why is my service line listed as unknown?
In some cases, records are incomplete or unavailable. An “unknown” classification means the material has not yet been verified. Utilities are required to investigate and update these classifications over time.
Who is responsible for replacing a lead service line?
Under the LCRI, water systems are responsible for ensuring the full replacement of lead service lines. The City of Bloomington Utilities will replace all utility owned lead and GRR service lines. CBU also aims to work with property owners to find solutions for replacing privately owned lead and GRR service lines.
How will I be notified if my service line is lead or unknown?
Customers will receive direct notifications if their service line is identified as lead, galvanized requiring replacement, or unknown. These notices include health information and steps to reduce exposure.