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Are there approved methods for sewage sludge (biosolids)?

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Are there approved methods for sewage sludge (biosolids)?

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EPA has approved the following microbial methods for use in biosolids: EPA Method 1680 and 1681 for fecal coliforms and EPA Method 1682 for Salmonella. 40 CFR Part 136 chemical methods are not approved specifically for use in biosolids.

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