Drinking Water Service Line Inventory

The City of Rockville is committed to keeping your drinking water safe and protected from lead. All water testing is in compliance, and no lead service lines have been identified in the city.

In 1991, the Environmental Protection Agency (EPA) introduced the Lead and Copper Rule (LCR) to limit the concentration of lead and copper in public drinking water and place limits on the extent of pipe corrosion. The EPA further strengthened the LCR by finalizing the Lead and Copper Rule Revision (LCRR) in January 2021 and the Lead and Copper Rule Improvements (LCRI) in October 2024.

Since the implementation of the LCR, the City of Rockville has actively followed the regulations to ensure safe drinking water for our residents and customers. The city is currently taking important steps in the national effort to protect consumers from exposure to lead in drinking water. The LCRR and LCRI require water service providers to identify and inventory the materials of all water service lines in their water system. This includes the utility or public side, which the city maintains, and the private side, which is maintained by the property owner.

In response to the directives outlined in the LCRR and LCRI, the City of Rockville will provide the following supplementary resources to inform and support our residents and customers regarding the status of their current water service line materials:

• Establishment of an inventory of all service line materials on both the public and private side.
• Notification letters sent to customers with unknown private service lines providing additional information to assist identification. Please refer to the Service Line Inventory Survey section below for survey instructions.
• Preparation of a lead service line replacement plan, if needed.
• Review and optimization of the current corrosion control treatment and compliance sampling plan.

Service Line Inventory Map

View information regarding the service line on your property by entering your address into the Service Line Inventory Map.

Note: Not all Rockville addresses are provided water by the city. Check your address in the Water Service Provider Map to see if your water is provided by the city or WSSC Water. All actions and communications by the City of Rockville apply only to customers provided water by the city. Customers not served by the city will receive updates and notifications from WSSC Water. City staff will continue to meet with WSSC Water staff to coordinate and maintain consistency with actions taken in response to the EPA’s lead and copper regulations, as appropriate.

Service Line Inventory Survey and Water Sample Testing Request 

The City of Rockville extends appreciation to all customers who participated in the Service Line Inventory Survey and requested water sample testing. Participation has been invaluable in supporting compliance with EPA regulations and in protecting the safety of the city’s drinking water supply. 

• Service Line Inventory Surveys: The city conducted two Service Line Inventory Surveys in November 2024 and July 2025 to identify materials used in the city’s drinking water service lines. 

• Water Sample Testing: The first round of water sample testing has been completed. A second round is currently underway as of September 2025, and the city will contact all participants directly regarding next steps. 

• Key Findings: No lead service lines have been identified within the City of Rockville’s water system as of September 2025. 

Next Steps: Work continues toward developing a comprehensive inventory of all water service lines. Additional updates will be provided as further actions and plans related to service line materials are determined. 

Lead Service Line Replacement Plan

The city is currently developing a service line replacement plan based on the inventory results, as required by the EPA. Currently, there are no known lead service lines in the system. The city is required to fund the replacement of the public portion of the service line. While the city is not required to fund the replacement of the private side of the service line, this will be reevaluated once more data is obtained.