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
Sep 23, 2025 - EPA Signals Support for Passive Receivers of PFAS
- In September, the Environmental Protection Agency (EPA) issued a press release saying the agency would retain the hazardous substances designation for two common PFAS chemicals but would support Congressional efforts to protect “passive receivers” of PFAS, according to Water Finance & Management. The hazardous substances designation through the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) imposes retroactive liability on polluters. CERCLA liability enforcement can sometimes extend to passive receivers who received pollutants in feedstocks, waste, or products. Water and wastewater utilities have been concerned about potential CERCLA liabilities since two types of PFAS (PFOA and PFOS) were designated hazardous substances in July 2024. In February, the bipartisan Water Systems PFAS Liability Protection Act of 2025 was introduced in the House. The bill enjoys broad support from water industry organizations.
- The Environmental Protection Agency’s (EPA) motion in a federal appeals court to partially vacate its 2023 PFAS drinking water standards introduces significant regulatory uncertainty for water and wastewater utilities. Citing procedural violations of the Safe Drinking Water Act, the agency acknowledged it finalized enforceable limits for four PFAS compounds without allowing adequate public comment on the regulatory determination, according to WaterWorld Magazine. If the court grants the vacatur, utilities may need to reassess compliance strategies and delay capital investments in PFAS treatment systems already underway. The proposed compliance deadline extension from 2029 to 2031 reflects EPA’s recognition of the operational and financial burdens utilities face. For utilities, the outcome could reshape monitoring plans, treatment priorities, and long-term infrastructure planning tied to PFAS mitigation.
- In mid-July, the US House Interior Subcommittee issued its Environmental and Related Agencies Bill for fiscal 2026, and it proposes funding cuts for the EPA and two water infrastructure programs. The bill would reduce spending on the Drinking Water State Revolving Fund (DWSRF) by 19% from $1.1 billion in fiscal 2025 to $894.7 million. The proposed legislation, which has passed to the Senate, also includes a 25% reduction in funding for the Clean Water State Revolving Funds (CWSRF) program, which, through the EPA, provides clean water grants to all 50 states and Puerto Rico. Under the proposed bill, funding for CWSRF would fall from $1.6 billion in fiscal 2025 to about $1.21 billion. In a statement responding to the budget proposal, the Association of Metropolitan Water Agencies said the 20% cut to DWSRF would further strain financially strapped water systems and challenge their ability to maintain services.
- The global smart water metering market has grown to a value of $6.8 billion as the sector has become a key driver of the water utility industry’s digital transformation, according to Bluefield Research. In 2024, smart metering accounted for 25% of digital spending by water utilities. Technologies like automated meter reading and advanced metering infrastructure help utilities better manage water system assets, measure water more accurately, reduce lost revenue, and improve customer engagement. About 20 vendors control more than three-quarters of the smart metering market. However, smart metering is attracting new entrants, including software and telecom firms, to a traditionally hardware-focused industry.
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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