Lead and Copper Rule Improvements: Service Line Inventory Rules for Facilities That Own Their Water
If your plant, school, or campus runs its own well, federal lead service line inventory rules already apply. EPA is enforcing now. Here is how to check.
On February 20, 2026, EPA Region 7 signed an administrative order against a school district in Belleview, Missouri. Docket SDWA-07-2026-0153 alleges no contaminated water, no treatment failure, and no sick child. The finding is that the district failed to develop or submit its initial service line inventory to the State by the October 16, 2024 deadline. The order gives 30 days to build and file the inventory and 30 more to notify the people it serves. Paragraph 25 puts its exposure at an administrative civil penalty of up to $49,848, and up to $71,545 per day for violating any term of the order.
That is an order, not a collected fine. No penalty was assessed and none has been paid. EPA’s sequence is an order first, with a penalty complaint only if the order is ignored.
A K-8 district in a Missouri town of a few hundred drew a federal drinking water enforcement action for missing a spreadsheet deadline, because it pumps its own water and serves the same 25-plus people most of the year. If a school on a well meets that test, so does a plant.
Rule status as of August 31, 2026
The Lead and Copper Rule Improvements (LCRI) is in effect and unstayed. It was published at 89 FR 86418 on October 30, 2024, took effect December 30, 2024, and carries a compliance date of November 1, 2027 under 40 CFR 141.80(a)(3). Oral argument in the industry challenge, American Water Works Association v. EPA, D.C. Cir. No. 24-1376, is scheduled for September 30, 2026, and the docket contains no stay of the rule. Nothing in the Federal Register has delayed, remanded, or reproposed it. A ruling could land inside this post’s useful life, so treat the 2037 replacement horizon as contingent and the 2024 and 2027 dates as firm.
Start here: are you a public water system at all?
Most facilities get this wrong because nobody told them the answer is arithmetic rather than a permit. 40 CFR 141.2 defines a public water system as one providing water for human consumption through pipes or other constructed conveyances if it has at least fifteen service connections or regularly serves an average of at least twenty-five individuals daily at least 60 days out of the year.
Read it as an OR. Fifteen connections alone qualifies you, and so do twenty-five people. Ownership does not enter into it, since “public” describes who drinks the water rather than who owns the pipe. The 60-day clause is where facilities trip: a plant running two shifts of 40 people on its own well clears 25 individuals daily on far more than 60 days a year.
Five questions you can answer without calling anyone:
- Does your potable water come from your own well or intake, or from water you purchase and redistribute through your own lines? An end customer behind one municipal meter is generally not a separate system.
- Do you have 15 or more service connections, or do 25 or more people drink, wash, or cook with that water on an average day for 60 or more days a year? Either one makes you a public water system.
- Are 25 or more of them the same people for more than six months a year, without being year-round residents? That is a non-transient non-community water system, and 40 CFR Part 141 Subpart I applies.
- Are 25 or more of them year-round residents, or do you have 15 or more residential connections? That is a community water system, and all of Subpart I applies.
- Still unsure? Search SDWIS by facility name. A PWSID coming back settles it.
Is my factory a public water system if it has its own well?
Yes, if it has at least 15 service connections or regularly serves an average of 25 or more individuals daily at least 60 days a year, per 40 CFR 141.2. Ownership is irrelevant. A plant serving 25 workers a day from its own well is a public water system and has been one continuously.
The definition is self-executing, so the status does not wait on a letter from a state agency. A facility that has never had a sanitary survey can still sit inside it.
What is the difference between a community water system and a non-transient non-community water system?
A community water system serves at least 15 connections used by year-round residents or 25 year-round residents. A non-transient non-community system regularly serves at least 25 of the same persons over 6 months per year without being residential, per 40 CFR 141.2. Factories, schools, hospitals, and office buildings with their own supply are NTNCWSs.
The word carrying the weight is “same.” A truck stop serving 500 different drivers a day is transient. A plant serving 60 of the same employees is not.
Does the LCRI apply to non-transient non-community water systems?
Yes. 40 CFR 141.80(a)(1) applies Subpart I to community water systems and non-transient non-community water systems. Transient systems are excluded. EPA’s preamble at 89 FR 86418 names schools, factories, office buildings, and hospitals with their own water systems as regulated NTNCWSs.
EPA counts 66,947 systems subject to the rule, of which 57,330 serve 3,300 people or fewer. That looks more like a facility than a city.
Does a school with its own well have to do its own lead service line inventory?
Yes. 40 CFR 141.92(a)(2) provides that the school and childcare monitoring program does not apply to a school or child care facility that is regulated as a public water system. No municipality will cover you. EPA signed Administrative Order SDWA-07-2026-0153 against a Missouri school district on 2026-02-20 for exactly this failure.
A school served by a city gets sampled under the city’s program. A school on its own well owes its own inventory, its own notifications, and eventually its own replacement program.
LCRR versus LCRI: the deadline you already missed and the program you have not started
The rule has three generational layers, and collapsing them is the most common error in trade coverage. The 1991 rule set a lead action level of 0.015 mg/L. The 2021 Lead and Copper Rule Revisions (LCRR) added the service line inventory as a freestanding obligation due October 16, 2024. The 2024 LCRI superseded most of the LCRR, kept that deadline, and stacked a much larger program on top with a compliance date of November 1, 2027.
The mechanics live at 40 CFR 141.80(a)(4)(i), the bridging provision almost nobody cites. Between October 30, 2024 and November 1, 2027 systems comply with Subpart I as codified on July 1, 2020, meaning the 1991 rule at 0.015 mg/L, except that they must also comply with an enumerated set of LCRR-derived provisions: 141.84(a)(1) through (10) excluding (a)(6) and (7) for the initial inventory, 141.85(a)(1)(ii) and (e) for notification, 141.90(e)(1) and (13), (f)(4) and (h)(3) for reporting, and 141.201(a)(3)(vi) and 141.202(a)(10) for Tier 1 public notice. That bridge is why a facility sits under a 0.015 mg/L action level and an enforceable inventory obligation that came due nearly two years ago. LCRR gave you the deadline you already blew. LCRI gives you the program you have not started.
| Element | LCRR (in force now, via 141.80(a)(4)(i)) | LCRI (in force 2027-11-01) |
|---|---|---|
| Initial inventory | Due 2024-10-16. Every line categorized lead, GRR, non-lead, or unknown. Retained verbatim by LCRI. | Superseded by the baseline inventory, 141.84(a)(2) |
| Baseline inventory | Not required | Due 2027-11-01. Adds connectors plus a street address or unique locational identifier for every line, 141.84(a)(2) to (4) |
| Inventory updates | Not required | Annual, starting one year after 2027-11-01, submitted to the State, 141.84(b)(1) |
| Validation | Not required | Visual inspection at 2 or more points on a sample of the non-lead pool, 20% (pool under 1,500) up to 384 (pool over 50,000), 141.84(b)(5) |
| Lead action level | 0.015 mg/L | 0.010 mg/L, 141.80(c)(1). Copper stays 1.3 mg/L |
| Trigger level | Existed | Removed |
| Replacement | Rate-based, exceedance-triggered | Mandatory regardless of exceedance. 10 program years, 10% cumulative average annual minimum, 141.84(d)(1), (d)(4), (d)(5)(i) |
| Replacement plan | Not required | Due 2027-11-01, 10 elements, publicly accessible, 141.84(c) |
| Unknowns | Permitted indefinitely | All resolved by the replacement deadline, 141.84(b)(1)(i) |
| Consumer notice | Within 30 days of the initial inventory, then annually | Within 30 days of the baseline inventory and of each annual update, 141.85(e)(2) |
| Schools and childcare | Not applicable | CWS samples the schools it serves, but 141.92(a)(2) excludes any school regulated as a public water system |
When was the lead service line inventory due?
The initial inventory was due to the State by 2024-10-16 under 40 CFR 141.84(a)(1), a deadline the LCRI expressly retained. The expanded baseline inventory, which adds connectors and addresses, is due by 2027-11-01 under 141.84(a)(2). Two separate inventories, two separate deadlines.
Missing the 2024 date also triggers a public notification of that failure, per EPA’s October 2024 Compliance Advisory.
Is the Lead and Copper Rule Improvements compliance date still November 1, 2027?
Yes. 40 CFR 141.80(a)(3), verified against the eCFR as issued 2026-08-27, sets 2027-11-01. No Federal Register action has stayed, delayed, or reproposed it as of 2026-08-31. The pending D.C. Circuit challenge, No. 24-1376, has produced no stay; oral argument is set for 2026-09-30.
EPA is implementing on a parallel track. An August 27, 2025 memorandum tells primacy agencies to submit a final LCRI primacy revision application no later than October 30, 2026.
What is the lead action level under the LCRI, and when does it change?
0.010 mg/L, at 40 CFR 141.80(c)(1), effective for compliance purposes on 2027-11-01. Until then, 40 CFR 141.80(a)(4)(i) keeps systems on the 1991 rule’s 0.015 mg/L action level. Copper stays at 1.3 mg/L in both periods. The LCRR trigger level is eliminated.
From the compliance date, 141.86 also requires paired first-liter and fifth-liter samples and a revised site hierarchy, so a long-standing site pool has to be rebuilt.
What actually goes in the inventory
What is a galvanized requiring replacement service line?
Per 40 CFR 141.2, a galvanized service line that currently is or ever was downstream of a lead service line, or is currently downstream of a lead status unknown line. Critically, if you cannot demonstrate it was never downstream of lead, it is a galvanized requiring replacement line for inventory and replacement purposes. The burden of proof runs against you.
Records work is what keeps a galvanized line out of the replacement pool. Texas alone offers a documentary shortcut, treating its lead ban date of July 1, 1988 as a cut for designating a line non-lead.
What if my entire inventory is “unknown”?
Permissible for the 2024 initial inventory, not permissible long-term. 40 CFR 141.84(b)(1)(i) requires identifying the material of every lead status unknown service line by the mandatory replacement deadline. Nationally, 22,450,443 lines, 21.88 percent of all reported, are still classified unknown as of the 2026Q2 SDWIS export, per iSi analysis of EPA SDWIS data.
Unknown is also the answer that costs most to carry. A lead or GRR line found after an all-non-lead inventory triggers State notification within 60 days under 141.84(b)(1)(ii) and full replacement within 180 days under 141.84(d)(4)(ii). One surprise during a utility cut becomes a six-month construction obligation.
Do I have to replace the customer-owned portion of a lead service line?
Only where you have access. 40 CFR 141.84(d)(2) requires replacement where the system has legal and physical access. Where consent is required, 141.84(d)(3) requires a reasonable effort of at least four attempts using at least two different communication methods. Failure to obtain consent must be documented to the State. This provision is under challenge in D.C. Cir. No. 24-1376.
For a single-site industrial system the access problem largely disappears, because the system and the property owner are the same entity. For a campus with leased buildings, it does not.
Enforcement and who is holding the pen right now
Who enforces the LCRI in Kansas, Missouri, Oklahoma, and Nebraska, EPA or the state?
Both, but EPA is currently the direct enforcement authority for the LCRR and LCRI provisions until each state obtains primacy for the new regulation. EPA’s Region 7 order against a Missouri school district states that MoDNR has not obtained primacy for the LCRR or LCRI. State primacy applications are due 2026-10-30.
The Region 8 order against Holmberg Village Estates, Docket SDWA-08-2026-0024 dated November 14, 2025, says the same about Montana.
What are the penalties for failing to submit a lead service line inventory?
Up to $71,545 per day per violation in a judicial action under SDWA Section 1414(b), and up to $49,848 administratively under Section 1414(g)(3)(B), per 40 CFR 19.4, for penalties assessed on or after 2025-01-08. EPA issued administrative orders in November 2025 and February 2026 citing exactly these figures for missed inventories.
That $71,545 comes from EPA’s civil monetary penalty inflation adjustment at 90 FR 1375, January 8, 2025, the provenance EPA’s own 2026 orders cite. There is no 2026 EPA adjustment. Both located actions are compliance orders, not penalty assessments.
One relief valve
Can a small system avoid corrosion control treatment under the LCRI?
Sometimes. 40 CFR 141.93 lets small community systems serving 3,300 or fewer and all non-transient non-community systems that exceed the lead action level but not the copper action level elect point-of-use devices or an alternative, with State approval. NTNCWSs must deploy point-of-use devices to every cooking and drinking tap within three months.
Every NTNCWS qualifies regardless of size. The catch sits in the same section: the flexibility is unavailable where a State took primacy for Subpart I without adopting a consistent provision.
The numbers say almost nobody is finished
First, the national inventory is still mostly guesswork. Of 102,595,243 reported service lines, 22,450,443 (21.88 percent) carry a lead status of unknown, against 3,191,000 confirmed lead plus galvanized requiring replacement. That is iSi analysis of EPA’s SDWIS service line inventory export for the 2026Q2 submission quarter, not an EPA finding. EPA’s own caveat runs the same direction: states are not required to report non-lead counts until November 1, 2027, so the unknown share is conservative and the true figure is likely higher.
Second, non-transient non-community systems are the worst reporters in that dataset. In the same iSi analysis of EPA SDWIS data, 6,659 systems reported no required service line types at all: 3,513 of 49,378 community systems (7.1 percent) against 3,146 of 17,036 NTNCWSs (18.5 percent). Nearly one in five schools, plants, and campuses filed nothing.
Third, EPA conceded the cost problem in its own preamble. At 89 FR 86609, EPA estimates incremental annual costs exceed three percent of revenues for 26,993 to 27,568 small community water systems, roughly six in ten, and finalized the rule anyway.
Fourth, the cost estimate for this buyer segment is borrowed. The same preamble states EPA derived cost of capital from the 2006 Community Water System Survey and, lacking comparable data for NTNCWSs, applied the community system figure to them.
Fifth, the utility sector’s challenge is live. AWWA targets the 10-year replacement mandate as infeasible and the obligation to replace privately owned line portions where the system has access. It has not sought or obtained a stay, and nothing in the docket suspends the 2024 or 2027 deadlines.
Sixth, EPA moved a comparable deadline next door and declined to move this one. On May 20, 2026 EPA proposed extending PFOA and PFOS MCL compliance by two years under SDWA Section 1416(f) at 91 FR 29425. No parallel proposal exists for the LCRI.
What to do in the next 30 days
Answer the classification question first, in writing, with the 141.2 arithmetic shown. If the answer is yes and nothing was filed by October 16, 2024, you owe the inventory plus a public notification of the missed deadline. Categorize every line as lead, galvanized requiring replacement, non-lead, or unknown, on your state’s form: Kansas requires its LSLI Form under K.A.R. 28-15a-32, and Missouri mandates its own templates and rejects EPA’s. Two derived dates belong on the calendar beside the codified ones. The first annual inventory update falls at approximately November 1, 2028, and validation is complete December 31, 2034. Neither is stated in the rule text; both are computed from it.
Three pieces of work sit between a facility and a defensible file: a system classification determination that settles whether Subpart I applies, inventory development and a records review that turn tap cards and plumbing drawings into a line-by-line categorization, and a field investigation for whatever comes back unknown. iSi has run environmental and drinking water compliance programs across 40 states for more than 35 years. We Plug In on the classification call, the records dig, and the unknown-line work, and You Level Up with a program your own team can carry from there. If you are not certain whether you are a public water system, start with that question.
Sources
- LCRI final rule, 89 FR 86418, October 30, 2024: https://www.federalregister.gov/documents/2024/10/30/2024-23549/national-primary-drinking-water-regulations-for-lead-and-copper-improvements-lcri (verified 2026-08-31)
- EPA Civil Monetary Penalty Inflation Adjustment, 90 FR 1375, January 8, 2025: https://www.federalregister.gov/documents/2025/01/08/2025-00206/civil-monetary-penalty-inflation-adjustment (verified 2026-08-31)
- Extending the Compliance Deadline for the PFOA and PFOS MCLs, 91 FR 29425, May 20, 2026: https://www.federalregister.gov/documents/2026/05/20/2026-10086/extending-the-compliance-deadline-for-the-pfoa-and-pfos-maximum-contaminant-levels (verified 2026-08-31)
- 40 CFR 141.2, definitions: https://www.ecfr.gov/current/title-40/section-141.2 (verified 2026-08-31, Title 40 issue date 2026-08-27)
- 40 CFR 141.80, applicability, compliance dates, action levels: https://www.ecfr.gov/current/title-40/section-141.80 (verified 2026-08-31)
- 40 CFR 141.84, service line inventory and replacement: https://www.ecfr.gov/current/title-40/section-141.84 (verified 2026-08-31)
- 40 CFR 141.85, public education and consumer notification: https://www.ecfr.gov/current/title-40/section-141.85 (verified 2026-08-31)
- 40 CFR 141.86, tap sampling: https://www.ecfr.gov/current/title-40/section-141.86 (verified 2026-08-31)
- 40 CFR 141.92, school and child care monitoring: https://www.ecfr.gov/current/title-40/section-141.92 (verified 2026-08-31)
- 40 CFR 141.93, small water system compliance flexibility: https://www.ecfr.gov/current/title-40/section-141.93 (verified 2026-08-31)
- 40 CFR 19.4, civil monetary penalty table: https://www.ecfr.gov/current/title-40/section-19.4 (verified 2026-08-31)
- EPA Compliance Advisory, October 2024: https://www.epa.gov/enforcement/compliance-advisory-failure-comply-certain-new-safe-drinking-water-act-lead-and-copper (verified 2026-08-31)
- EPA LCRI Questions and Answers, updated 2026-03-11: https://www.epa.gov/ground-water-and-drinking-water/lcri-questions-and-answers (verified 2026-08-31)
- EPA memorandum, Primacy for the 2024 Lead and Copper Rule, August 27, 2025: https://www.epa.gov/system/files/documents/2025-09/final-memo-to-wdds-on-primacy-crosswalk-and-supporting-documents-august-2025.pdf (verified 2026-08-31)
- EPA, Information about Public Water Systems: https://www.epa.gov/dwreginfo/information-about-public-water-systems (verified 2026-08-31)
- EPA SDWIS Service Line Inventory report and CSV export, 2026Q2: https://sdwis.epa.gov/ords/sfdw_pub/r/sfdw/sdwis_fed_reports_public/service-line-inventory (verified 2026-08-31)
- Administrative Order, Belleview R-III School District, Docket SDWA-07-2026-0153, March 9, 2026: https://yosemite.epa.gov/OA/RHC/EPAAdmin.nsf/Filings/0F181C8F5DC2683685258DB700687EC5/$File/Belleview%20Elementary%20School%20Administrative%20Order.pdf (verified 2026-08-31)
- Administrative Order cover letter, Wolfe Water Management / Holmberg Village Estates, Docket SDWA-08-2026-0024, November 14, 2025: https://yosemite.epa.gov/oa/rhc/epaadmin.nsf/Filings/B3304E832D7AE54085258D460041F139/$File/SDWA-08-2026-0024%20MT0004178%20Holmberg%20Village%20%20Estates%20LSLI%20Cover%20Letter.pdf (verified 2026-08-31)
- American Water Works Association v. EPA, D.C. Cir. No. 24-1376: https://www.courtlistener.com/docket/69469512/american-water-works-association-v-epa/ (verified 2026-08-31)
- KDHE Kansas LSLI Requirements guidance, K.A.R. 28-15a-32: https://www.kdhe.ks.gov/DocumentCenter/View/20263/LSLI-Requirements-Guidance-PDF (verified 2026-08-31)
- Missouri DNR Lead Service Line Inventory: https://dnr.mo.gov/water/business-industry-other-entities/technical-assistance-guidance/lead-service-lines/inventory (verified 2026-08-31)
- TCEQ Lead Service Line Inventory Under LCRR: https://www.tceq.texas.gov/assistance/resources/the-advocate-1/lead-service-line-inventory-lead-and-copper-rule-revisions-lcrr (verified 2026-08-31)
Statistical note: the service line counts and percentages in this post are iSi analysis of EPA’s SDWIS Service Line Inventory CSV export for the 2026Q2 submission quarter, covering 66,414 systems. They are not EPA-issued figures. EPA does not require states to report non-lead counts until November 1, 2027, so the non-lead total is an undercount and the unknown share reported here is conservative.