Public sewer service is provided in many areas of the township by the Suburban Lancaster Sewer Authority (SLSA). Billing questions: 717-560-1900. Service calls: 717-560-7500. Properties not served by public sewer service utilize on-lot septic facilities which are the responsibility of the property owner. On-lot septic systems are regulated by the State Department of Environmental Protection and township ordinances. A Sewage Enforcement Officer (SEO) is retained by the Township to assist property owners with on-lot septic system issues.