Abstract: A chemical pump containment for enclosing chemical injection pumps mounted on portable chemical tanks used at remote injection sites for collecting leakage generally associated with such pumps and returning such leakage to the tank without contamination. The invention including a lower housing having an adapter for securing the containment to the tank and containing one or more pumps suspended therein. A water tight upper portion is provided and attached to the lower portion by a single fastener for fast removal and service. Leakage from the pumps or connection thereto passes directly though an opening in the adapter and is returned to the tank. The entire containment assembly including its tank adapter may be easily removed when filling the tank with chemicals.