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In an era where contaminants like PFAS and microplastics are rapidly emerging, staying ahead of the regulatory curve isn’t just good practice—it’s a legal requirement. The AWWA M55 “Water Quality Standards Handbook” consolidates every EPA‑mandated limit, testing method, and QA/QC tip into a single, searchable PDF. Whether you’re drafting a sampling plan for a new distribution system or auditing an existing treatment plant, having the handbook at your fingertips can shave hours off your compliance workflow. awwa m55 pdf free download top