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|Regulatory Action                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Type of System and Total Number | Number Systems Affected | Total Population Served by 
              the Affected Systems | CWS       | NTNCWS | Total | System Size | 25-500 | 501-3,300 | 3.3K-10K | 10K-and above | CWS System Size | Costs ($ )
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------- | ----------------------- | -------------------------------------------------------------- | --------- | ------ | ----- | ----------- | ------ | --------- | -------- | ------------- | --------------- | ----------
|Drinking Water 
              and
                 Health Basics
            Frequently 
              Asked
                 Questions
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              Water
                 Information
            Drinking 
              Water
                 Standards
            List of Contaminants 
              &
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|EPA 815-F-00-016
            January 2001                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Table 1. Estimates 
              of the Number of CWSs and NTNCWSs
              That Would Need to Treat and the Population Served by These Systems                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|
|10 μg/L                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | CWSs (54,000)                   | ~ 3,000                 | ~ 11 million                                                  
|10 μg/L                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | NTNCWSs (20,000)                | ~ 1,100                 | ~ 1.7 million                                                 
|Table 2. Annual 
            National System and State Compliance Costs
            (3% Discount Rate, $millions)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|System Costs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                                 |                         |                                                               
|Treatment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | $170                            | $7.0                    | $177                                                          
|Monitoring/Administrative                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | $1.8                            | $0.9                    | $2.7                                                          
|State Costs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | $0.9                            | $0.1                    | $1.0                                                          
|Total Cost                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | $173                            | $8                      | $181                                                          
|Table 3. Total 
              Annual Costs (Dollars) per Household for CWSs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|
|Annual
              Household
              Costs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | $ 327-$162                      | $ 71-$58                | $ 38                                                           | $32-$0.86
|Table 4: Average 
              Annual Costs per CWS (Dollars)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|
|25-500                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | $6,494-$12,358                 
|501-3,300                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | $22,100-$53,086                
|3,300-10,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | $111, 646                      
|10,000 and above                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | $531,584-$1,340,716            
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