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Below 5 ppb
5-14 ppb (elevated)
15+ ppb (at/above EPA action level)
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of samples below EPA action level (15 ppb)
Distribution of lead levels
Results by borough
Top 10 ZIP codes by percentage above action level
| ZIP code | Samples | Above 15 ppb | % above |
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Recent reports (larger = more recent)
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water main break reports
Monthly reports over time
Reports by borough
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Turbidity over time
Measures water clarity in nephelometric turbidity units (NTU). The city’s mains carry both filtered Croton water and unfiltered Catskill/Delaware water. EPA limits: 1 NTU for filtered water, 5 NTU for unfiltered source water. Below 0.5 NTU is excellent.
Residual free chlorine over time
Chlorine added to kill pathogens. EPA minimum: 0.2 mg/L throughout distribution. Typical range: 0.2-1.5 mg/L.
Total coliform over time
Indicator bacteria (MPN/100mL). "<1" means none detected. No more than 5% of monthly samples should test positive.
Fluoride over time
Added for dental health. Recommended level: 0.7 mg/L. EPA maximum: 4.0 mg/L.