No, a pink residue is not a problem with your water quality, and is not harmful in this situation. It is evidence of bacteria that are common inhabitants of our environment. The most typical of these bacteria is one known as Serratia marcescens. These bacteria come from any of a number of naturally-occurring sources, such as soil, mulch, dust, and surface waters, and they thrive in an environment that is moist and high in phosphates.

Serratia infection is responsible for about 2% of nosocomial infections of the bloodstream, lower respiratory tract, urinary tract, surgical wounds, and skin and soft tissues in adult patients.
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Until the 1950s, S. marcescens was erroneously believed to be a nonpathogenic “saprophyte”, and its reddish coloration was used in school experiments to track infections. It was also used in biological warfare testing by the U.S. military as a substitute for weaponized tularemia bacteria. On September 26 and 27, 1950, the U.S. Navy conducted a secret experiment named “Operation Sea-Spray” in which S. marcescens was released by bursting balloons of it over the densely populated San Francisco Bay Area in California. Although the Navy apparently believed the bacteria were harmless, beginning on September 29, 11 patients at a local hospital developed very rare, serious urinary tract infections, and one of these individuals, Edward J. Nevin, died. Cases of pneumonia in San Francisco also increased after S. marcescens was released.