Water Supply and Sewage Treatment NAICS 221310, 221320
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Industry Summary
The 3,900 water supply and irrigation system companies in the US store, pump, treat, and deliver water to customers. The 340 sewage treatment companies operate sewer systems or sewage treatment facilities that collect, treat, transport, and recycle wastewater. The sale of water accounts for the majority of industry revenue. Large firms may offer both water supply and sewage treatment services. Some firms also offer other types of utilities, such as electric power or gas.
Aging Infrastructure and Funding Gap
The water and wastewater infrastructure in the US is aging, and many systems are nearing the end of their useful life and in desperate need of modernization and replacement.
Rising Rates
Despite public pressure to keep rates low, the water supply and sewage treatment industry has been able to raise rates consistently with healthy increases over time.
Recent Developments
Mar 24, 2026 - PFAS Compliance Strains Water Utility Finances
- Cities across the US face mounting financial pressure to meet EPA deadlines for removing PFAS, or “forever chemicals,” from drinking water, raising concerns for water utilities and infrastructure operators, according to Smart Cities Dive. Regulations finalized in 2024 require monitoring by 2027 and compliance by 2029, though some deadlines may extend to 2031. Experts say treatment could cost utilities billions annually, straining budgets and driving affordability challenges, especially for smaller systems. Despite more than $50 billion in federal funding from the 2021 infrastructure law, many communities still lack resources to upgrade aging systems and install advanced treatment technologies. Legal challenges and policy shifts add uncertainty, while utilities must balance compliance, public expectations, and financing.
- The U.S. Department of the Interior will invest $889 million in western water infrastructure, a move with significant implications for water utilities and system operators managing aging assets, according to Water World. Funded through the One Big Beautiful Bill Act, the projects target conveyance, storage, and system upgrades to improve reliability in drought-prone regions. California will receive $540 million for major canal repairs and capacity improvements, while other states will fund pumping, pipeline, and tunnel upgrades. The investment aims to modernize infrastructure, boost efficiency, and expand water supply for agriculture, communities, and industry. For utilities, the funding highlights growing capital needs to maintain and upgrade legacy systems, improve resilience, and meet rising demand, even as gaps remain in direct federal support for local water utility infrastructure.
- Full flow has been restored to the Potomac Interceptor near Washington, DC, following a major January rupture that released about 243 million gallons of untreated sewage, according to Engineering News-Record. The sewage spill, one of the largest on record, underscores significant challenges for wastewater utilities managing aging infrastructure. DC Water completed emergency repairs and a bypass system that prevented nearly 2 billion additional gallons from reaching the Potomac River. The focus has shifted to environmental cleanup and long-term rehabilitation of the 1960s-era pipeline, with repair costs estimated at $20 million to $30 million and potential implications for a planned $625 million systemwide upgrade. Federal assistance is expected to cover 75% of eligible costs.
- In late January, President Trump signed an $8.8 billion EPA budget, according to Waste Dive. The budget offers mixed implications for water utilities, preserving core water quality and infrastructure programs while keeping overall funding historically constrained. The bill maintains support for PFAS research, drinking water safety initiatives and grants for well owners, and it directs new work on PFAS management in agricultural settings, all of which shape future regulatory and treatment requirements for utilities. Although the budget is 4% lower than last year and includes a steep cut to Superfund, it still provides more stability than the deeper reductions previously proposed by the White House. However, the agency’s reduced staffing levels after last year’s reorganization could slow permitting, oversight and technical guidance that water utilities rely on.
Industry Revenue
Water Supply and Sewage Treatment
Industry Structure
Industry size & Structure
The average water supply and sewage treatment company employs 11-18 workers and generates $4 million in annual revenue.
- The water supply and irrigation system industry consists of about 3,600 firms that employ about 39,500 workers and generate about $12 billion annually. The sewage treatment industry consists of about 330 companies that employ about 5,800 workers and generate $1.5 billion annually.
- The industries appear concentrated; the top 50 companies account for between 71% and 87% of industry revenue. However, government ownership (at the local level) skews the concentration percentage, and both the water supply and sewage treatment industries are more fragmented than Census numbers reveal.
- The majority of community water systems and wastewater treatment systems are government-owned. About 5% of Americans receive water through investor-owned water supply utilities.
- Large government-owned systems include the New York City and Washington DC systems. Large investor-owned firms include American Water, Aqua America, and United Water (Suez Environment).
- According to the Cybersecurity and Infrastructure Security Agency, approximately 80% of the US population obtains its water from public drinking water systems. About 15% of households obtain water from private wells, according to the EPA. The US has 50,000 community water systems, of which 91% serve less than 10,000 customers. The US has 16,000 wastewater facilities that serve 80% of the population.
Industry Forecast
Industry Forecast
Water Supply and Sewage Treatment Industry Growth
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