Assertion: river's level | /r/HasProperty | improved with improved sewage treatment
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text: The measurements show poor quality along most of the river, with excess nitrogen, silt and phosphorus, though E. coli levels have improved with improved sewage treatment, though generally not enough for safe swimming; recreational rivers should have median E. coli levels below 126 per 100ml, but Waipa's range from 160 to 320.