MADISON, Wis. -- The numbers are starting to pour in from the citywide study of manganese in Madison's water supply.

The results, gathered from the high manganese Well 3 on the isthmus, found that all but one of the first 39 random tap water samples from that area are below federal guidelines for both color, odor and health, WISC-TV reported.

Union Cab, a business on Pennsylvania Avenue on Madison's East Side, wasn't so lucky. Its sample came in 36 above the federal Environmental Protection Agency health advisory limit of 300 parts per 1 billion.

City officials said that a month-old advisory for those serviced by Well is still in effect. The advisory recommends infants on ready-to-mix formula and people with liver problems not use tap water.

Those serviced by Well 10, which includes the Nakoma neighborhood, Mohawk Circle and other areas south of the Beltline, also remain under a similar advisory.

That advisory remains in effect because officials turned that well back on Monday morning. The well wasn't pumping for two years, and now crews are starting a special main flushing, WISC-TV reported.

Water utility crews are also continuing to go to randomly selected homes in those two areas of the city to collect home tap samples. About 250 homes in both the Well 10 and Well 3 areas are being studied.

Joe Grande, an engineer for the Madison Water Utility, which is conducting the tap studies, said that most residents have been cooperative with the testing.

"I've had people who quizzed me on what I know about manganese and what I know about the water supply but, overall, most people have been grateful that we are out here doing this and trying to figure out what what's going on," Grande said.

Homeowners are notified by postcard when crews will be coming by, and the test results are mailed back to the residents in about a week, WISC-TV reported.

Eventually, the city will randomly study tap water at homes across Madison to find out the extent of the manganese problem.

The controversy began in May when city officials issued an advisory to some residents about the health effects stemming from high levels of manganese found in the water.

Officials said that ingestion of high levels of manganese, a naturally occurring metal, over a period of time can cause neurological problems.