Dear Carol 88
Im my country, there is a set of regulatory parameter to check on, which include:
Physical standard: pH, colour, turbidity
Chemical standard: aldrin/dieldrin, Aluminium, ammonia, anionic detergent, antimoni, arsenic, barium, biocides, bromodichloromethane, bromoform, boron, cadmium, carbon chloroform extract, chlordane, chloride, chromium, chloroform, chlorpyrifos, copper, cyanide, 2,4-D, DDT, dibromochloromethane, endosulfan, fluoride, hardness, heptachlor & heptachlor epoxide, hexachlorobenzene, iron, lindane, lead, manganese, magnesium, mercury, methoxychlor, mineral oil, nikel, nitrite (calculate as NO2 -, NO3 -, N), phenol, residual chlorine (free), selenium, silver, sodium, styrene, sulphate, zinc.
Microbe standard:
Total coliform, e.coli, fecal streptococci, pseudomonas aeroginosa, clostridium perfringens, sulphite reducing anaerob.
Radioactivity:
Gross α
Gross β
Besides fulfill your own country requirements, you need to fulfill exporting country requirements as well.
Testing frequency for full set of above is yearly, in my experience.
Additional test on physical standard, total chlorine, residual chlorine, total coliform, e.coli depend on your risk assessment.
Hope it helps.
Rgds
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