Lead Service Line Replacement Standard

Purpose

A lead service line does most of its damage on the day somebody works on it. Cutting, flexing, hammering or a hard shock from a closing valve knocks accumulated scale off the inside wall, and the lead bound in that scale goes downstream to the tap. That is the mechanism behind the post-work spike, and it is why a well-meant half job leaves a household worse off: replace the customer's side, leave the utility's side in the ground, and you have disturbed the lead you left behind while giving it a fresh open path. This procedure guarantees a lead or unknown service is replaced end to end in one coordinated event, that every lead-bearing component goes with the pipe, and that the household is flushed, filtered and told in writing before the crew leaves.

Scope

Covers replacement of a lead or lead-status-unknown water service serving a house, duplex, small retail unit or small restaurant: coordination with the water system, method selection, disturbance controls, the pipe and its fittings, return to service, and the handoff to flushing and notification.

Does not cover identifying the material, which the Plumbing service line material verification methods SOP owns. Does not cover the general excavation, one-call, depth, tracer wire, pressure test and disinfection mechanics common to any service replacement, which the Plumbing water service line replacement SOP owns and which apply here unchanged. Does not cover interior galvanized downstream of the lead, its own inventory category with its own assessment SOP. Does not cover main tapping, curb stop operation or anything on the utility side of the boundary.

Roles and responsibilities

Procedure

1. Confirm in writing that the whole service is being replaced on one day before anybody mobilizes. Acceptance: a written confirmation on the job file naming the date, both sides of the boundary, and which crew connects at the main. What wrong looks like: a work order reading "replace customer side", or a verbal "the city will get to theirs eventually". Stop rule: no partial is performed and the crew does not open ground to find out; the job stands down and goes back to the lead. Hazard: none at this step, it is desk work, but doing it late is what puts a crew in a hole holding a decision they are not authorized to make.
2. Verify the occupant provisions and the disturbance controls exist before the first cut. Acceptance: the written notice delivered, a filter certified to NSF/ANSI 53 for lead reduction on site, and the crew's lead controls present. What wrong looks like: a filter promised for next week. Stop rule: no lead is cut until the filter is in the building. Hazard: this is lead in construction under 29 CFR 1926.62, whose trigger tasks require protection before an exposure assessment is complete, and a respirator is only available under a written program per 29 CFR 1910.134 with medical evaluation and fit test; a crew without that program does not do the work that requires one.
3. Pick the method by how much of the remaining system it disturbs, not by which trench is fastest. Acceptance: the method named on the ticket with the reason the alternative was ruled out, and pit locations marked. What wrong looks like: full open cut across a finished yard when a pull-through from two small pits touches the same pipe. Stop rule: if the ground cannot be opened at both ends on the scheduled day, the whole event moves rather than starting the half that can be done. Hazard: an unsupported excavation 5 ft deep or more takes a protective system per 29 CFR 1926.652(a)(1), egress within 25 ft of lateral travel applies at 4 ft or more per 1926.651(c)(2), and spoil stays back from the edge.
4. Isolate and prove the service dead at an open fixture before any tool touches the old pipe. Close the customer stop, or have the system close the curb stop, then open a low fixture and watch flow stop and stay stopped. Acceptance: no flow and no pressure for a full minute, the fixture left open through the work. What wrong looks like: a stop that keeps dribbling, which means it is passing. Stop rule: a passing curb stop is the system's valve and their repair, so call rather than cut against pressure. Hazard: an old lead or brass joint letting go under residual pressure sprays scale-laden water at face height, so the tech stands to the side of the union and lets the open fixture prove the line first.
5. Cut the lead cold at both ends and take it out without dragging it through the building. Use a wheeled cutter or a shear on the lead, keep the cut area damp, bag the removed pipe. Acceptance: both cuts cold, all pipe and swarf bagged, the work area wet-wiped or HEPA vacuumed before anyone eats, drinks or leaves. What wrong looks like: a torch, an abrasive wheel, a grinder or a wire wheel on lead. Stop rule: flame or abrasion on lead is a hard stop whatever the schedule pressure. Hazard: torch heat generates lead fume and abrasion makes respirable particulate, an inhalation route gloves and glasses do nothing about; no dry sweeping and no compressed air on lead debris, collect wet or with a HEPA vacuum per 29 CFR 1926.62.
6. Replace every lead-bearing component on that service, not only the run of pipe. The gooseneck at the main, the meter setter, the valve bodies and the fittings either side of the meter all get specified. Acceptance: each new wetted component certified to NSF/ANSI 61 and NSF/ANSI 372, the lead free limit the Reduction of Lead in Drinking Water Act set at a 0.25 percent weighted average of wetted surfaces effective January 4, 2014, and each old component removed or listed as retained with whose it is. What wrong looks like: a new plastic service landing on a retained brass setter of unknown vintage. Stop rule: a lead-bearing component the system owns and will not swap that day is recorded as retained and reported, and the service is not written up as lead free. Hazard: reaming new tubing throws sharp swarf toward the eyes, and old brass and solder residue is handled as lead-bearing, not as scrap in a bare hand.
7. Put pressure back in stages, prove the joints, and confirm the protective devices you disturbed still work. Acceptance: refill slowly with a fixture open to purge air, then a static hold at the pressure and duration the purveyor or code official states with no measurable drop over the full period and the run visible; then confirm the pressure reducing valve, where the building has one, still holds its downstream setting and the thermal expansion control is still connected. What wrong looks like: a gauge that falls a little and gets backfilled anyway. Stop rule: any measurable drop means find it, repair it, and re-run the whole hold from the start rather than the remaining time. Hazard: this is where energy goes back into a system just taken apart, with the customer nearby, so nobody stands over the joint while it comes up, and the refill is slow enough not to slam a check or a closing valve, since that shock is the exact disturbance this procedure exists to avoid.
8. Hand the job to the flushing and notification procedures, then move the record. Acceptance: the post-replacement flush performed with its record attached, the written flushing instruction and filter signed for by the occupant, and a written material change reported to the water system naming the new material per side with the date. What wrong looks like: a finished replacement that leaves the public inventory still reading lead. Stop rule: the job is not closed until the flush record exists, and a signature on a filter receipt is not a flush record. Hazard: none at this step, it is paperwork, but an unguarded verbal answer about whether the water is safe is the sentence the customer repeats, so the wording is standing shop language and the health question routes to the system and a state-certified laboratory.

The record this produces

One service replacement record per address, holding: the system's written confirmation that both sides were scheduled together; the method and why; measured depth and tracer wire termination; the certification of every new wetted component; every lead-bearing component retained, with its owner; the hold test pressure, duration and result including any re-run; the flush record; the signed occupant instruction and filter receipt; and the material change report sent to the system.

The office reads the retained-component list when the customer calls in a year about a taste complaint. The system reads the material change to close the inventory row. The next tech reads the depth, the pit locations and the joint photographs before digging near the route.

One worked pass, including a failure

A 1938 single-family bungalow. Verification found lead on both sides, curb stop to interior wall measured at 38 ft, local frost depth 42 in.

Step 1: the system's written confirmation names a single date and puts their crew on the main-side connection. Step 2: notice delivered five days ahead, one filter certified to NSF/ANSI 53 for lead reduction fitted at the kitchen cold tap, crew respiratory program confirmed in writing. Step 3: pull-through selected from a curb pit and a foundation pit, opening roughly 10 ft of ground instead of 38 ft and flexing the old lead once at extraction rather than repeatedly along its length. Step 4: curb stop closed by the system, hose bib open, no flow for a full minute, bib left open. Step 5: both ends cut cold with a shear, 38 ft of lead bagged, cut area wet-wiped.

Step 6: new tubing and fittings certified to NSF/ANSI 61 and 372. The meter setter is original brass and the system will not swap it that day, so it is recorded as retained and system-owned; the service is written up as replaced with one lead-bearing component retained, not as lead free.

Step 7 fails. The permit condition is a 15 minute static hold at 100 psi with no measurable drop. The gauge opens at 100 psi and reads 92 psi at 15 minutes, so 100 minus 92 leaves 8 psi against an acceptance of none. Stop rule taken: no backfill. The leak is at the transition coupling behind the pull head, made up in the pit with grit on the sealing surface. Coupling cut out, tube end reamed and cleaned, new coupling made up, and the full 15 minutes re-run from zero rather than continued: 100 psi to 100 psi, no movement. The downstream pressure reducing valve is then confirmed holding its setting and the expansion tank still connected.

Step 8: flush run and recorded, instruction and filter signed for, material change reported per side with the retained setter named, so the system's inventory row does not close as clean.

References

• 29 CFR 1926.62 for lead in construction trigger tasks, and 29 CFR 1910.134 for the written respiratory program any respirator use depends on.
• 29 CFR 1926.652(a)(1) for the 5 ft protective system trigger and 1926.651(c)(2) for the 4 ft egress requirement, both construction excavation.
• The EPA Lead and Copper Rule Revisions and Lead and Copper Rule Improvements, administered through your state's primacy agency, for the inventory categories and the system's replacement duty.
• NSF/ANSI 61 and NSF/ANSI 372 for every component that touches potable water.
• See related: the Plumbing service line material verification methods SOP, the water service line replacement SOP, the post-replacement flushing and sampling SOP, and the customer notification and flushing instructions SOP.