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LT1 General Info
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LT1 General Requirements


 

For PWS serving fewer than 10,000 people and use Surface Water or Ground Water Under the Influence of Surface Water (GWUDI) as the source water

Web Links:

    http://www.epa.gov/safewater/mdbp/lt1eswtr_fact.html

    http://www.epa.gov/fedrgstr/EPA-WATER/2002/January/Day-14/w409.htm

1.   Provisions

A.     Maximum contaminant level goal (MCLG) for Cryptosporidium is zero

B.  Cryptosporidium minimum physical removal for filtered systems is 99% (2-Log)

C.  Update watershed control programs for unfiltered systems

2.   Requirements: Monitor Filter Effluent Turbidity

A.      Filter Effluent Turbidity must be measured and recorded every 4 hours

B.  Conventional and direct filtration

    1.  ≤ 0.3 NTU in at least 95% of measurements taken each month

    2.  Maximum turbidity level: 1 NTU

C.  Slow sand and diatomaceous earth (DE) filtration

    1.  1 NTU in at least 95% of measurements taken each month

    2.  Maximum turbidity level: 5 NTU

D.  Alternative technologies

    1.  ≤ 1 NTU in at least 95% of measurements taken each month

    2.  Maximum turbidity level: 5 NTU


 

 

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Last modified: June 11, 2007