DDW-2024-014145

TC = Total Coliform EC = E coli

Bacteriological Flow Chart
State of Utah
REVISED TOTAL COLIFORM RULE
(RTCR)
(Effective 4/1/2016)
GROUNDWATER
RULE (GWR)
(Effective 12/1/2009)
Level 1 Site Assessment
-Required when:
1. Two or more TC+ samples (routine
and repeat results) in one month.
2. Fail to collect 3 repeat samples for each routine TC+
-May be performed by the Water System
Level 2 Site Assessment
Required when:
1.TC+ routine and EC+ repeat sample
2. EC+ routine and TC+ repeat sample
3. Fail to collect all 3 required repeats
following an EC+ rountine sample.
4. Two Level 1 triggers in 12 months
-Must be performed by the DDW or DDW
approved third party
-Notify the DDW and LHD
-Level 2 Assessment required
-Issue Tier 1 Public Notice*
which includes a "Boil Order"
TC+ EC+ (E coli +)
REPEAT
-Collect a set of 3 repeat samples
for EACH TC+ within
24 hours at these locations:
1. Original site
2. Upstream
3. Downstream
Return to routine sampling
TC-EC-
Collect 3 repeat samples until TC is not detected in two complete sets of repeats
TC+ or EC+
No violation
End sampling
TC-EC-TRIGGERED SOURCE SAMPLES
Collect 1 sample
within 24 hours at
these locations:
1. Each source in use
at the time of the TC+
or,
2. At an approved
DDW representative
site (SSG01)
Collect samples
before treatment
No violation
End sampling
TC+ EC-
TC+ EC+
*Issue GWR Tier 1 Special
Notice* and Tier 1 Pulic
Notice*
-Collect 5 confirmation
source samples from the
source(s) that had EC+
No violation
End sampling
TC-EC-
No violation
End Sampling
TC+ EC-
TC+ EC+
Perform corrective action
TC+ sample(s) require meeting the requirements of both the GWR
and RTCR. Contact DDW : 801-536-4200. Submit reports to:
DDWReports @utah.gov See also: www.drinkingwater.utah.gov
First positive repeat in 12 months
-Perform Level 1 Assessment
-Issue Tier 2 Public Notice* -Fix Sanitary Defects
-Submit Assessment form to the DDW within 30 days
Two level 1 triggers in a 12-rolling month period
-Level 2 Assessment is required -Contact DDW
-Issue Tier 2 Public Notice* -Fix Sanitary Defects
TC+ EC-
Tier 2-Provide public notice within 30 days (posting, hand/direct delivery, mail a separate notice or include with a bill)
Tier 1 GWR Special Notice
1. Fecal indicator-positive source
2. Uncorrected significant deficiencies
-Provide Special Notice annually until
DDW determines the significant
deficiencies are corrected and the fecal
contamination is addressed.
Tier 1 -Provide notice within 24 hrs.
(posting, hand delivery, radio, TV)
-Report to DDW and LHD
-Issue Boil Order
*PUBLIC NOTICE
GW
R
RTCR
RTCR SITE ASSESSMENTS