altered or relocated portion of any watercourse is maintained require that manufactured homes must be elevated and anchored to resist flotation, collapse, or lateral movement The Code of Federal Regulation (CFR) "Suspension of community eligibility" says communities that do not adequately enforce flood plain management regulations meeting the minimum requirements shall be placed on probation.Failure to correct the violation will result in the community losing eligibility for the NFIP. Optional stricter standards The NFIP encourages communities to adopt floodplain management standards more restrictive than the NFIP minimum standards. Communities must consider the additional measures specified in 44 C.F.R. § 60.22. Some states and communities enforce a more protective "Regulatory Floodway" by limiting the cumulative increase in water surface elevation to a half-foot or tenth of a foot instead of the NFIP minimum standard increase of one-foot. This 44 C.F.R. § 60.22 says community flood plain management regulations should permit only development in flood-prone areas that is appropriate with the probability of flood damage. Flooding can damage underground storage tanks (USTs) resulting in leaks of petroleum that contaminate soil, surface water, and groundwater. USTs may even float out of the ground during floods. This 44 C.F.R. § 60.22 says community flood plain management regulations should prohibit public utilities to be installed in flood prone areas unless it is essential to be located there. Leakage from on-site sewage systems cause contamination problems during floods. Sanitary sewer overflows and combined sewer overflows also release sewage contaminates into flood water. The U.S. Environmental Protection Agency advises "Avoid contact with flood water due to potentially elevated levels of contamination associated with raw sewage and other hazardous or toxic substances that may be in the flood water." This 44 C.F.R. § 60.22 says community flood plain management regulations should divert development to areas safe from flooding to prevent environmentally incompatible flood plain uses. Ruptures of crude oil pipelines result in crude oil contamination of floodplains. Oil spills create numerous environmental harms. Releases of gasoline, oil, or natural gas during floods also create fire hazards. This 44 C.F.R. § 60.22 says community flood plain management regulations should provide access requirements so that people do not become isolated by flood water. The Illinois Supreme Court found: Safety guidance for propane tanks in floods says propane tanks in floodplains need to be secured to prevent them from floating off during flooding. Propane tanks floating in floods break the connecting