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Columbia County: Environmental Health
Impact of TS Debby in North Florida: An Observational Study Concerning Levels of
Total Coliform Bacteria and E. coli in Water Supply Systems
byDavid H Boniche
Background: Tropical Storm Debby• June 23-June 27, 2012• Mean Rainfall: 15 inches• Flash Flooding• $20 million damage in
Columbia County, FL• Potential Negative Impacts
on Floridian Aquifer and Water Supply Systems
Source: Hydrometeorological Prediction Center , July 2012,. Author: David Roth.
Background: FL Water Supply Systems
• DEP: Community Water Systems, Transient-Non Community, and Non-Transient Non-Community (SDWA)(80%).
• DOH: Limited-Use (381.0062 F.S/ Ch. 64E-8 F.A.C)
• Unregulated: Private Wells (Single-Family)
Objectives
• Assess the impact between a natural disaster (TS Debby) and the potential environmental health effects (water quality in drinking water supply systems).
• Analyze the stability of drinking water supply systems with a special emphasis on the vulnerability of Private Wells towards contamination when faced with a natural disaster (such as TS Debby).
Methods: Total Coliform Bacteria and E coli Test
• Observational Study of Archived and Ongoing Coliform Test Data in Columbia and Nearby Counties.
• Sample sets: - January 9, 2012- November 1, 2012 (all supply types)
(n = 4,714)- Period involving TS Debby (June 25, 2012 – August 16,
2012; only private wells) (n =1,338)- First-time submissions of private wells during the
period involving TS Debby. (n = 527)
Methods: Standard Method #9223 B
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 440
20
40
60
80
100
120
Results: Presence of Total Coliform in 2012 for All Supply Types
Coliform
Week in 2012
Sam
ple
Po
siti
ve
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 440
5
10
15
20
25
Results: Presence of E Coli in 2012 for All Supply Types
E coli
Week in 2012
Sam
ple
Po
siti
ve
Methods
• Coliform Test compared with Spatial Data: Rainfall Dispersion, Recharge Potential, and Flood Zones (ArcGIS Geocoding)
Results: Total Coliform and E coli
Supply Type Sample Number
Failure rate E coli
Private 28% 45% 7%
CWS 18% 2% 0%
2012: n = 4,714
8 week Period (TS Debby): n = 1,338 Supply Type Sample
Number Failure rate E coli
Private 52% 56% 10%
CWS 12% 1.7% 0%
8 Week Period (TS Debby) (First-Time): n = 527
Supply Type Failure rate E coli
Private 55% 11.9%
Discussion
• High rates of contamination align with areas of high rates of sample submissions
• Observational Study: data is a function of sample submissions
Discussion
• Strengths: Coliform Test, Inspiration for Future Studies
• Limitations: Premature Negatives, Observational Study
Implications: MPH Competencies
• Applying laws and regulations that protect health and ensure safety
• Specify approaches for assessing, preventing, and controlling environmental hazards that pose risks to human health and the environment.
Acknowledgements
• John Lednicky (University of Florida)• Sallie Ford (Columbia County Health Dept)• Paul Muller (Columbia County Health Dept)• Megan Wetherington (Suwannee River Water
Mgt District)• Bebe Willis (Suwannee River Water Mgt District)
Thank You
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