Private Pipe, Public Problem

The most comprehensive study on private-property I&I contribution was conducted by Strand Associates for Sanitation District No. 1 of Northern Kentucky, reviewing data from more than 350 communities. The findings are consistent: private property I&I as a percentage of total I&I ranges from 20% to 80%, with a central tendency around 40% to 60%.

Individual community data points reinforce this range. Houston measured 80% of I&I from private sources. Lower Paxton Township, Pennsylvania documented 60%. Columbus, Ohio found 55%. WSSC in the Washington, D.C. region measured 43%. Lynchburg, Virginia found 20% at the low end. The EPA itself estimates that at least 50% of inflow and infiltration originates from private properties, a figure cited across multiple municipal programs and consent decree documents.

The fundamental math supports this consensus. Total linear footage of lateral lines connected to public systems is roughly equivalent to total linear footage of sewer mains. An estimated 500,000 miles of private laterals connecting roughly 100 to 110 million properties. That means approximately half the United States pipe network is private lateral pipe that has historically received virtually no inspection or maintenance.

The evidence is now conclusive that rehabilitating mainlines without addressing laterals captures only a fraction of the I&I problem. Blueprint Columbus, the most comprehensive municipal lateral program in the nation, documented 25% to 35% I&I reduction from mainline and manhole rehabilitation alone. Adding private lateral rehabilitation yielded an additional 30% to 40% reduction, bringing total mitigation to 65% to 75%.

Jefferson County, Alabama provides an even more dramatic example. At the Chapel Drive Pump Station, where 85% of mainlines had already been rehabilitated with CIPP, adding lateral lining achieved an 89% to 90% reduction in volume and 70% to 79% reduction in peak flow. The mainline work alone had not solved the problem; the laterals were the remaining and dominant source.

St. Petersburg, Florida's 2019 pilot study with more than 300 residents demonstrated a 34% I&I reduction from private lateral repairs alone, and 64% combined when paired with public system improvements. Every utility that has completed a mainline CIPP program and then measured residual flows has discovered the same thing: laterals are the remaining problem.

Untreated I&I imposes direct and measurable costs on utilities and the communities they serve. Tennessee's statewide study found that I&I accounts for 45% of annual flow to the state's 227 municipal wastewater treatment plants, costing approximately $188 million annually in unnecessary treatment. In the ALCOSAN system in Allegheny County, Pennsylvania, approximately 40% of all dry-weather flow is I&I, and during wet weather, infiltration can add 3,000 gallons per person per day, a 30x overload compared to the 100 gallons per capita average dry-weather flow.

The EPA estimates that 23,000 to 75,000 sanitary sewer overflow events occur annually nationwide, discharging 3 to 10 billion gallons of untreated sewage into waterways. Each SSO carries regulatory penalties, environmental damage, and public health risk. The economic case for lateral rehabilitation is straightforward: data from the Hampton Roads Sanitary District shows that I&I removal via private service laterals costs $3.59 per gallon removed, compared to $7.91 per gallon for public right-of-way mainline work. Lateral rehabilitation is more than twice as cost-effective per gallon of I&I eliminated.

The federal regulatory posture has evolved decisively toward treating private laterals as a utility management responsibility, regardless of private ownership. The EPA's foundational CMOM guidance explicitly asks whether utilities have ordinances addressing defects in service laterals on private property, establishing the expectation that utilities must manage lateral-sourced I&I. The CMOM Self-Assessment Checklist treats lateral policies as a compliance indicator.

Consent decrees have become the primary enforcement mechanism compelling lateral programs. The EBMUD Regional Private Sewer Lateral Program, established in 2009, remains the most directly lateral-focused federal consent decree in the nation. It mandates point-of-sale lateral inspections, requires rehabilitation upon property transfer or remodels exceeding $100,000, and establishes performance standards for both upper and lower laterals. Before the consent decree, I&I during severe wet weather caused a greater-than-10-fold increase in flows reaching the interceptor system. The program's final compliance deadline extends to December 31, 2035.

Other major consent decrees now include lateral components. St. Louis MSD (2012) required the district to replace, rehabilitate, or repair private lateral connections and established a no-cost construction program for low-income property owners with defective laterals. Houston's 2021 consent decree includes a dedicated Private Laterals section requiring the city to notify owners of defective laterals and enforce correction. EPA has noted that 92% of the largest wastewater systems in the country have been subject to enforcement actions, signaling that virtually every major utility faces potential lateral-related compliance obligations.

Federal funding mechanisms explicitly support lateral rehabilitation. The Bipartisan Infrastructure Law reauthorized the Clean Water State Revolving Fund with $11.7 billion in supplemental appropriations for FY2022 through FY2026, and CWSRF eligibility explicitly covers facilities whether publicly or privately owned for wastewater collection. The Sewer Overflow and Stormwater Reuse Municipal Grants Program provides $280 million annually for I&I correction projects. WIFIA loans, which have financed over $44 billion in water infrastructure projects, are eligible for sewer lateral rehabilitation. The Toho Water Authority in Florida secured a $40 million WIFIA loan specifically for sewer assessment and rehabilitation in Kissimmee.

Florida presents a uniquely severe I&I environment. The state sits atop the Floridan Aquifer System with seasonal high water tables ranging from land surface to just 6.6 feet below grade. Soils are predominantly porous sand underlain by limestone, creating rapid percolation pathways.

A University of South Florida study in Pinellas County found that in sub-sewersheds with the shallowest water tables, an average of 56% of daily sewer flow consisted of groundwater, and 100% of the measured I&I was groundwater infiltration with no surface inflow detected. Rain impacts on the water table persist for up to 9 days, with peak rainfall-infiltration correlation occurring 3 to 5 days after storm events. This explains why Florida utilities see sustained elevated flows long after rainfall ends, a pattern that distinguishes the state from regions where I&I is primarily surface-inflow driven.

Climate change compounds the problem. Miami's sea level has risen more than 4 inches since 1994, progressively raising coastal water tables and increasing hydrostatic pressure on buried infrastructure. FDEP Collection System Action Plans now explicitly require utilities to address resiliency for sea-level rise and flood mitigation.

The 2020 Clean Waterways Act (SB 712) represented a step-change in Florida's enforcement posture. The law doubled SSO penalties, authorized daily fines until violations are corrected, required all wastewater facilities to develop Collection System Action Plans with 5-year planning horizons, and mandated that FDEP submit annual SSO reports to the Governor and Legislature. The implementing rules (Chapter 62-604 F.A.C., effective October 4, 2021) explicitly require systems to minimize infiltration, inflow, and leakages and mandate corrective action when I&I is excessive.

Collection System Action Plans must cover a minimum 25% of the collection system evaluated over each 5-year period, include I&I studies and SSES work, and address local sewer ordinances for private lateral I&I. Facilities above 1 MGD must maintain computerized GIS maps. Annual reports due June 30 must include I&I expenditure data, creating an unprecedented transparency requirement.

Critically, Florida does not set specific numerical RDII limits. The standard is performance-based: I&I is excessive only if it causes SSOs. This reactive framework means enforcement intensifies primarily after failures occur, but the Collection System Action Plan requirements are pushing utilities toward proactive management.

Private lateral legislation has been introduced in multiple consecutive sessions. SB 1420 (2023) would have authorized municipalities to access private sewer laterals for investigation, repair, and replacement, required publicly accessible databases of defective laterals, and specified that repairs must provide a continuous monolithic pipe system, language that effectively describes CIPP rehabilitation. The bill died in committee, as did predecessor bills SB 1058 (2021), SB 608 (2022), and HB 303 (2022). However, existing Florida Statutes Sections 125.569 and 166.0481 already authorize counties and municipalities to access sanitary sewer laterals for investigation, cleaning, repair, reconditioning, or replacement with 14-day notice. Several municipalities are already operating under this existing authority.

Combined, these programs represent more than $3.8 billion in active or committed rehabilitation spending across Florida. This figure does not include the dozens of smaller Florida utilities that will face increasing pressure as Collection System Action Plan requirements take full effect.

Florida's Clean Water State Revolving Fund program has surpassed $4 billion in total loans and consistently funds I&I reduction projects involving trenchless technologies. Recent hurricane supplemental allocations are transformative: the SA-HMW program for Hurricanes Helene and Milton (2024) allocated $806 million for CWSRF projects in Florida alone, with at least 30% as additional subsidization and 100% principal forgiveness for disadvantaged communities.

CDBG-DR funding has added further resources, including $22.2 million for Avon Park's sewer rehabilitation and $16.4 million for Citrus County sewer replacement. The Governor's FY2025 awards included $311 million across 37 Florida communities for wastewater infrastructure improvements.

The Emerald Coast Utilities Authority operates the most mature lateral program in Florida, launched in 2014. Serving more than 70,000 customers across 1,225 miles of sewer, ECUA has inspected more than 5,000 laterals and rehabilitated more than 4,000 using CIPP lining with full-wrap Service Connection Seal technology. The program executes 800 to 1,200 laterals annually.

The program was initiated after post-mainline-CIPP flow monitoring revealed significant residual I&I from service laterals. ECUA enforces compliance with a 6-month window after defect notification, a $50 per month surcharge for non-compliance, and eventual service termination.

Pinellas County has established a four-pillar Private Sewer Lateral Program. A rebate program reimburses 100% of CCTV inspection costs (up to $350) and 50% of rehabilitation costs (up to $3,500), with $800,000 allocated for FY2023. A permitting policy requires lateral inspection with certain building permits. A proactive Find and Fix identification program targets known problem areas. Wade Trim is leading a 5-year, 20-year Wastewater Collection System Master Plan that addresses lateral I&I.

St. Petersburg is launching its Private Lateral Rehabilitation Rebate Program in phases. Phase 1 (June 2025) offers 100% reimbursement for inspection and rehabilitation in high-I&I neighborhoods, backed by a $500,000 initial allocation. Phase 2 (October 2026) caps reimbursement at $5,000 per property. The city has approximately 1,000 miles of private sewer laterals with average repair costs exceeding $7,000.

Blueprint Columbus represents the gold standard for comprehensive lateral programs, rehabilitating 20 project areas of approximately 1,000 acres each. All work is performed from manholes in the city right-of-way using CIPP. The program is 100% city-funded through SRF loans, an innovative use of public financing for private-side work.

The EBMUD Regional Private Sewer Lateral Program in the East Bay Area established the point-of-sale model now spreading across California. Compliance certificates are valid 7 years for repair and 20 years for replacement, with no-interest deferred payment loans up to $10,000 available to property owners.

CIPP lateral lining accounts for the majority of trenchless lateral rehabilitation work performed in the United States. The technology installs a resin-impregnated felt or fiberglass liner inside the existing host pipe, cures the resin in place using ambient temperature, hot water, steam, or ultraviolet light, and produces a structurally independent pipe-within-a-pipe with a design life of 50 years or more under ASTM F1216 design parameters.

Two product configurations dominate Florida public-side lateral specifications. The first is the one-piece main-to-lateral connection liner, exemplified by the LMK T-Liner, which extends a full-circle brim or full-wrap into the mainline and a cured liner up to 150 to 200 feet into the lateral. The second is the service connection seal plus lateral, historically commercialized by BLD Services, which combines a mainline connection seal with a separately installed lateral lining. Both technologies were developed under ASTM F2561, which prescribes design and installation for one-piece lateral lining with hydrophilic molded gaskets or hydrophilic paste at the seal interface.

UV-cured lateral lining is the fastest-growing rehabilitation modality in the residential and small-diameter lateral space. UV systems use a light-emitting curing head pulled through a fiberglass-reinforced liner pre-impregnated with a styrene-free vinyl ester or polyester resin. The cure is initiated by ultraviolet light rather than heat, water, or ambient time, which compresses the cure window from hours to minutes and reduces the styrene emissions that have driven Florida Department of Health concerns around traditional steam-cured CIPP. The Florida Department of Health has documented that volatile and semi-volatile compounds, including styrene, are released during steam-cured CIPP installation and has issued public-facing guidance acknowledging health-screening exceedances at installation sites.

The shift toward UV is being accelerated by three factors: documented health concerns around styrene emissions during installation, the operational efficiency of compressed cure cycles, and the fact that several utilities have begun to write specifications that allow UV LED curing as an alternative to thermal cure. The current barrier is not technology readiness; it is the procurement specification, which in most Florida utilities still anchors to ASTM F2561 with hydrophilic molded gaskets, a standard that effectively prescribes an installation method rather than a performance outcome.

The lateral rehabilitation market has undergone a structural consolidation in the last two years that fundamentally changes the competitive landscape and the procurement risk profile for utilities.

Azuria Water Solutions (formerly Aegion Corp., taken private by New Mountain Capital in 2021 and rebranded to Azuria, headquartered in St. Louis) now controls the dominant licensors and the dominant public-side installer in a single corporate structure:

• Insituform Technologies, LLC: Acquired as part of the original Aegion portfolio. Active in Florida with Tampa, Jacksonville, and Spring Hill operations. Holds a $30M Miami-Dade WASD CIPP mainline contract awarded April 2024 (Resolution R-265-24).
• BLD Services, LLC: Acquired by Azuria on June 16, 2025. BLD historically operated as the de facto category leader in U.S. public-side lateral CIPP and originated its lateral practice by acquiring Insituform's Cured-in-Place-Pipe Lateral Lining Division in 2008. The 2025 reacquisition reunites those businesses under common ownership.
• Waterline Renewal Technologies (WRT): Acquired by Azuria with the transaction closing on February 20, 2026 (announced February 25, 2026). The WRT acquisition brought four flagship brands under Azuria: LMK Technologies (Ottawa, IL), Perma-Liner Industries (Clearwater, FL), APM, and LightRay. Pipe Lining Supply, acquired by WRT in November 2021, is included in this transfer.

The combined entity now controls:

• The LMK T-Liner, the most frequently specified one-piece main-to-lateral product in Florida.
• The Insignia Hydro Hat and Insignia End Seal, the hydrophilic gaskets named or referenced by ASTM F2561 and F3240.
• Perma-Lateral and Flex-Liner, the products approved by Miami-Dade WASD for 2-inch through 8-inch installations.
• BLD's Service Connection Seal Plus Lateral, the historical alternative to T-Liner.
• LightRay UV LED, formerly positioned as the Waterline UV alternative to thermal-cure CIPP.
• Insituform, the largest mainline CIPP installer in Florida.

Combined, the LMK and Perma-Liner brands are estimated to represent 70% to 85% of Florida's certified public-side lateral installer crew base. Adding BLD, LightRay, and Insituform consolidates the licensor stack, the leading UV alternative, and the dominant installer crew capacity under a single corporate parent.

Azuria and Inframark (also a New Mountain portfolio company) announced a strategic merger in July 2025. The combined entity is expected to exceed $2 billion in revenue with more than 6,000 employees, creating a vertically integrated water and wastewater services platform with substantial Florida operations and maintenance reach.

The consolidation problem is amplified by a parallel issue in public procurement: most Florida utility specifications for lateral rehabilitation were drafted years before the recent technology and ownership shifts, and they continue to be reused with minimal revision. The result is that newer, independently validated systems with material performance that meets or exceeds the named products are routinely excluded from bid eligibility because they do not match the specific installation method or gasket configuration named in the specification.

The clearest example is ASTM F2561, the standard governing one-piece main-to-lateral CIPP. F2561 has long been described in the industry as a "patent-involved" standard, alongside F2599 (sectional CIPP) and F3240 (seamless molded hydrophilic gaskets), because its technical requirements are tightly aligned with the LMK T-Liner installation method and proprietary hydrophilic gasket geometry. The patents underlying these standards have been concentrated under common ownership through the Azuria consolidation described in Section 6.3.

Florida has already taken a code-level position on this issue. The Florida Building Code, Plumbing, 8th Edition (2023), Section 718.1 states only that "cured-in-place rehabilitation of building sewers and building drainage piping shall be in accordance with ASTM F1216 or ASTM F1743." The companion provision in the Florida Building Code, Residential, 8th Edition (2023), Section P3012.1 uses the same language. These provisions became effective April 16, 2024 under the 2024 Florida Building Code Supplement, and were reinforced by Florida Building Commission Declaratory Statement DS 2024-044 in February 2025.

The contrast with the model code is direct. Section 718 of the 2021 International Plumbing Code (IPC), which serves as the base code for the 8th Edition Florida Building Code, references ASTM F1216, F1743, F2561 (one-piece main-to-lateral CIPP), F2599 (sectional CIPP), and F3240 (hydrophilic gaskets). ICC's own CodeNotes guidance walks through each of these standards as part of the IPC Section 718 framework. Florida specifically excluded F2561, F2599, and F3240 from its plumbing code adoption. The 2021 Uniform Plumbing Code (UPC), used in California and other Western states, retained the same F2561, F2599, and F3240 references that Florida rejected.

This creates three concrete procurement risks for utilities still anchoring lateral specifications to F2561:

• Reduced bid competition. Specifications that name F2561 with hydrophilic molded gaskets effectively limit the eligible product pool to LMK T-Liner and BLD's SCS+L, both now Azuria-owned. Utilities are paying single-source pricing on what should be a competitively bid product category.
• Excluded innovation. Independently validated alternatives, such as the Cosmic Lateral Connection System (covered in Section 6.5), which uses an epoxy or adhesive bond rather than a hydrophilic gasket, cannot be specified as equivalents under current spec language even when the material performance data supports approval.
• Specification fossilization. Procurement officers and consulting engineers reuse prior specifications because the cost of redrafting is high and the political risk of approving a non-standard product is higher. This locks utilities into a 1990s-era technology stack while UV-cured systems, alternative bonding chemistries, and styrene-free resins move forward in the broader market.

The City of Shreveport's 2017 evaluation of the Cosmic Lateral Connection System under its EPA and LDEQ consent decree provides a concrete precedent for how utilities can structure pilot programs that introduce alternative technologies without abandoning specification rigor. CDM Smith, the consulting engineer of record, recommended that Shreveport revise its standard technical specification to allow Cosmic alongside the previously approved T-Liner and BLD products, citing increased competition, fair-share contractor participation, and material performance comparable to the named systems. The pilot installed 201 Cosmic full-wrap liners and air-tested 32 of them, showing a 3.1% failure rate compared to 4.3% for LMK T-Liner Shorty installations tested under the same protocol.

The Cosmic Lateral Connection System represents the clearest example of a material technology that meets or exceeds the performance characteristics implied by ASTM F2561 but cannot be specified under current Florida procurement language because its bonding mechanism is fundamentally different. Cosmic is manufactured by Cosmic Engineering GmbH (formerly Cosmic Sondermaschinenbau GmbH), based in Kasten, Austria, with North American operations through Cosmic Engineering GmbH's Washougal, Washington office. The company reports more than 150,000 installed Hat Profiles globally.

Cosmic uses a polyester or vinyl ester resin-impregnated, E-glass corrosion-resistant flexible fiberglass laminate liner with either a top-hat brim seal or a full-wrap configuration in the mainline. The liner is installed using a robotic crawler and packer, with epoxy or other adhesive products securing a permanent bond between the laminate, the liner, and the existing lateral pipe. The system is cured by ultraviolet light to form a tight-fitting, watertight pipe-within-a-pipe that eliminates infiltration at the connection of the service lateral to the mainline pipe, as well as up the lateral itself. Material specifications meet ASTM D790, D638, D543, D2990, and D578 (E-CR glass).

The most significant independent validation comes from the Trenchless Technology Center at Louisiana Tech University, which conducted custom pressure testing of the Cosmic system in 2021 (Dr. John Matthews and John Kraft, September 2021). Because no standardized test method existed for evaluating the bond integrity at the interface between a Cosmic lateral connection liner and a mainline CIPP liner, TTC designed a custom test that applied high water pressure directly to the interface via instrumented ports installed on the test specimen.

The result: the interface between the Cosmic connection liner and the mainline CIPP liner held approximately 400 psi before water began to leak between the two interfaces. TTC concluded that the bond is "very strong" and that the pressures measured during testing greatly exceed any pressure that would be encountered in a field application. TTC noted that further validation may be warranted, but the directional finding from two independent test setups (a 1,500 psi pressure washer for rapid loading and a 10,000 psi hand-controlled pump for slow loading over approximately 4 minutes) was consistent.

This is a meaningful data point for utility procurement. The hydrophilic gasket approach prescribed by ASTM F2561 is designed to seal against infiltration. The Cosmic adhesive bond approach is designed to do the same. TTC's testing demonstrates that the adhesive bond performs at pressures roughly 60 times higher than the 7 psi air test threshold most utilities use to verify lateral seal integrity in the field. The Cosmic system is one example of a category of newer adhesive-bonded and UV-cured technologies that current Florida specification language does not accommodate, even when material performance data supports it.

The United States has approximately 500,000 miles of private sewer laterals connecting to 800,000 miles of public sewers, representing an estimated 100 to 110 million private lateral connections nationwide. Florida alone accounts for an estimated 5.5 to 6.5 million connections based on approximately 9 million households with roughly 70% sewer connectivity. The average age of wastewater pipes nationally is 45 years, with older laterals predominantly vitrified clay that has never been inspected or maintained.

Stratview Research estimates the North American trenchless rehabilitation market at $4.3 billion in 2024, growing to $5.5 billion by 2030 at a 4.5% compound annual growth rate, with cumulative sales opportunity of $30.3 billion from 2025 to 2030. The CIPP segment alone represents $2.9 billion globally in 2024, growing to $4.0 billion by 2032.

Bluefield Research projects total U.S. and Canadian pipe capital expenditure at $117 billion from 2025 to 2035, with rehabilitation growing at a 15.1% CAGR, three times the rate of replacement (4.9%) and new construction (4.3%). Wastewater pipe investment growth of 7.15% outpaces drinking water at 5.18%.

Lateral rehabilitation specifically is identified as one of the fastest-growing segments in the trenchless industry, driven by five converging forces: aging infrastructure approaching end-of-life, escalating regulatory pressure through consent decrees and lateral ordinances, growing scientific consensus on lateral I&I contribution, expanding federal funding availability, and the demonstrated cost-effectiveness of trenchless lateral rehabilitation versus open-cut alternatives.