Mold needs moisture in order to grow and thrive. Many mold problems originate as a result of some kind of water intrusion, especially those that are not resolved quickly. In which case, water and pipe leaks are common culprits, since they provide plenty of moisture, and are often undetected for days, months, or even years if minor enough. When leaks are discovered, appropriate steps are not normally taken to minimize potential mold growth problems. A mold remediation or mold removal might be necessary if these pipes have leaked for a long enough period of time and aloud mold growth to occur. Often times this growth can occur in hard to find places where water leaks occur, such as wall cavities. Mold problems are very common after flooding for obvious reasons (plenty of moisture which is conducive for mold growth). If you have experienced a flood you might need a professional water damage repair, water extraction, or water restoration company to help with the water removal. Plus, it usually requires several days or weeks to fully dry out the home or building once flooding occurs, giving colonies of black mold more than adequate time to become fully ingrained in these sections (if you hire a professional restoration company it will SIGNIFICANTLY reduce the time it takes to dry your home or office.. Mold testing is always recommended after a mold removal or mold remediation to properly diagnose that all the mold has been removed.