Table 6.

Mean per capita net cost CWF and incremental cost (including potential treatment savings) per d_3vcft/D_3vcMFT prevented.

Source: Authors analysis of data from the FACCT Study [31] the Environmental Protection Agency [12], CSO [41], national audit of the CWF process [20] and the HSE

	WTP size	< 1000	1000–4999	5000–19,999	20,000–99,999	> 100,000	Average	PSA
Net cost CWF (€)*	5 years	22.86	− 6.95	− 13.16	− 14.95	− 15.79	− 14.18	− 13.75 SD: 3.67 UI: [− 8.09 to − 20.14]
	8 years	21.30	− 8.51	− 14.72	− 16.51	− 17.35	− 15.73	− 15.42 SD: 3.04 UI: [− 10.62 to − 20.59]
	12 years	13.25	− 16.55	− 22.77	− 24.56	− 25.40	− 23.78	− 23.85 SD: 5.10 UI: [− 15.53 to − 32.24]
Net cost per d3vcft/D3vcMFT prevented in 2017 (€)*	5 years	120.26	− 36.56	− 69.27	− 78.68	− 83.10	− 74.59	− 72.35 SD:19.31 UI: [− 42.57 to − 105.98]
	8 years	143.89	− 57.47	− 99.48	− 111.56	− 117.23	− 106.31	− 104.19 SD: 20.54 UI: [− 71.75 to − 139.12]
	12 years	113.90	− 142.30	− 195.76	− 211.13	− 218.34	− 204.44	− 205.03 SD: 43.84 UI: [− 133.51 to − 277.16]

*A negative value indicates a net cost saving, a positive value indicates a net cost