A central water system can be a big benefit. Other areas rely on wells. You will normally need five acres or more to receive a well permit. Exceptions are made, especially in the Aspen Springs Area because it was subdivided before the stricter regulations went into effect. When drilling a well, be aware of the fact that you may or may not hit good water.
Sulfur is a real problem in some areas.
The occurrence of rocky ground or shallow bedrock are the usual causes of more expensive systems. The San Juan Basin Health Department has authority over septic systems and a permit must be obtained. All systems must meet their standards. Citizen's Utilities provides a natural gas service in the country where applicable. Most areas do not have natural gas available.