The countdown to LCRI compliance
On November 1, 2027, the EPA’s Lead and Copper Rule Improvements take effect. The lead action level drops, baseline inventories and replacement plans come due, and optimal corrosion control becomes non-negotiable. Here’s the time you have left.
Four requirements every system has to meet.
The action level drops from 15 ppb to 10 ppb, tightening the threshold that triggers corrosion-control action.
An updated service-line inventory with connector material for every line in the distribution system.
A publicly accessible lead-service-line replacement plan, updated annually and online for large systems.
Consumer notification of individual tap results within three calendar days of the lab report.
A decade of deadlines, one program.
Initial inventory
The LCRR initial service-line inventory was submitted to the state.
Program design
Window to run jar tests, coupon studies, and Corrator corrosion-rate work so a treatment change is proven before it has to be defended.
LCRI compliance date
Baseline inventory, replacement plan, 10 ppb action level, and school sampling all take effect.
Lower lead action level. Corrosion control is the answer.
A 10 ppb action level leaves no room for guesswork. Orthophosphate and zinc orthophosphate programs build a durable protective film at the pipe wall, keeping lead and copper out of the water that reaches the tap.
With decades of Lead and Copper compliance experience across the country’s largest utilities and smallest rural systems, we design optimal corrosion control treatment matched to your exact water chemistry.
What the 2027 rule requires.
When is the LCRI compliance deadline?
November 1, 2027. On that date the EPA’s Lead and Copper Rule Improvements take effect, and systems must meet the new action level, baseline inventory, replacement plan, and notification requirements together.
What is the new lead action level under the LCRI?
The lead action level drops from 15 parts per billion to 10 parts per billion. When the 90th percentile of tap samples exceeds 10 ppb, a system must act, which makes optimal corrosion control treatment far less forgiving of an imprecise dose.
Does the LCRI require replacing all lead service lines?
Yes. Systems must replace all lead and certain galvanized service lines by December 31, 2037, generally at a pace of at least ten percent per year. Corrosion control remains mandatory throughout the replacement period, because lead stays in the ground until the last line is out.
What is optimal corrosion control treatment (OCCT)?
OCCT is the treatment a system runs to minimize lead and copper at consumers’ taps, most commonly an orthophosphate or zinc orthophosphate program. Under the LCRI, systems that exceed the action level must re-optimize, and the state can require a formal OCCT study.
How quickly do utilities have to notify customers of tap results?
Within three calendar days of receiving the individual tap sampling result, down from thirty days under the previous rule. Systems also owe public notification within twenty-four hours of a lead action level exceedance.
How long does it take to optimize a corrosion control program?
Bench and coupon studies typically run several weeks, and a protective film needs months of consistent feed to mature in the distribution system. Starting well before November 2027 is what keeps compliance from becoming an emergency.
