The Swiss waste water is treated in 759 central treatment plants with more than 500 population equivalents. The replacement value is CHF 10.1 billion. In total, the annual costs of waste water treatment are CHF 875 million. 47,400 km public sewers remove waste- and stormwater with an estimated value of CHF 55.2 billion. CHF 875 million are spent for operation costs and capital expenditures every year. Two thirds of the sewage system was built within the last 50 years, whereas cities have significantly older facilities than rural communities. About 23 % of the investigated sewers show sewere damages. In addition, more than 3,400 individual sewage treatment plants, about 42,000 km private sewers and estimated 1,700,000 house connections contribute to the high level of sanitation service.