ENVIRONMENTAL FINAL GOVERNING STANDARDS ITALY

ITALY - 3 Drinking Water
Table 3.8. Disinfectant/Disinfection Byproducts Monitoring Requirements
Source Water Type
Surface Water (SW)
or Groundwater
Under the Direct
Influence of Surface
Water (GWUDISW)
Population Served
by System
Analyte &
Frequency of
Samples
10,000 or more TTHM & HAA5 –
Quarterly 1,2
SW or GWUDISW Serving 500 to 9,999 TTHM & HAA5 -
Quarterly 4
SW or GWUDISW 499 or less TTHM & HAA5 -
Yearly
Ground Water (GW) 10,000 or more TTHM & HAA5 -
Quarterly 9
GW 9,999 or less TTHM & HAA5 -
Yearly 12
Chlorite - Daily &
Monthly 15,16,17,18
Bromate -
Monthly 19,20
Chlorine 21,22
Chloramines 23,24
Chlorine
Dioxide 25,26,27
TOC 28
Number of Samples
September 2012 Italy FGS 3-31
Revision 0
4 1,2,3
1 5,6
1 7,8
1 10,11
1 13,14
Notes:
1. For TTHM and HAA5, a DoD system using surface water or GWUDISW that treats its water with a
chemical disinfectant must collect the number of samples listed above. One of the samples must be taken at
a location in the distribution system reflecting the maximum residence time of water in the system. The
remaining samples shall be taken at representative points in the distribution system.
2. To be eligible for reduced monitoring, a system must meet all of the following conditions: a) the annual
average for TTHM is no more than 0.030 mg/L; b) the annual average for HAA5 is no more than 0.030
mg/L; c) at least one year of routine monitoring has been completed; and d) the annual average source
water total organic carbon level is no more than 4.0 mg/L prior to treatment. Systems may then reduce
monitoring of TTHM and HAA5 to one sample per treatment plant per quarter. Systems remain on the
reduced schedule as long as the average of all samples taken in the year is no more than 0.030 mg/L for
TTHM and 0.045 mg/L for HAA5. Systems that do not meet these levels must revert to routine monitoring
the following quarter.
3. A system is noncompliant if the running annual average for any quarter exceeds the TTHM MCL, 0.030
mg/L or the HAA5 MCL, 0.060 mg/L.
4. One sample must be collected per treatment plant in the system at the point of maximum residence time in
the distribution system.
5. Systems meeting the eligibility requirements in Note 2 may reduce monitoring frequency to one sample per
treatment plant per year. Sample must be taken at the point of maximum residence time in the distribution