Estimating the duration and overlap of Escherichia coli contamination events in private groundwater supplies for quantitative risk assessment using a multiannual (2010–2017) provincial dataset

Microbial Contamination of Surface Water and Groundwater in Flood-Impacted Rural Communities in South Texas Following Hurricane Hanna

“…Another study which was based on multiannual (2010–2017) provincial data set for E. coli count in Ontario private wells has confirmed that out of 702,861 samples, 458,910 were associated with consolidated aquifers, while 243,951 samples were associated with unconsolidated aquifers . A study in New Jersey used a large data set to assess microbial contamination with increasing sample frequency .…”

“…Other factors, such as subsurface conditions, hydrogeological settings, and location, can determine to what extent private wells are susceptible to microbial contamination. For instance, unconsolidated aquifers are mainly characterized by clays, silts, and sands, which increase the residence time to reach the aquifer versus consolidated aquifers which have less natural infiltration …”

“…36 Latchmore et al ( 2020) studied private wells in Ontario and found that E. coli detection rate differed significantly depending on hydrological settings with consolidated aquifers to be associated with higher E. coli compared to unconsolidated. 37 Another study which was based on multiannual (2010−2017) provincial data set for E. coli count in Ontario private wells has confirmed that out of 702,861 samples, 458,910 were associated with consolidated aquifers, while 243,951 samples were associated with unconsolidated aquifers. 38 A study in New Jersey used a large data set to assess microbial contamination with increasing sample frequency.…”

Penilaian Kualitas Air Tanah dan Pengaruhnya terhadap Kesehatan Masyarakat di Kecamatan Sukun Kota Malang

“…Pinf annual Pill SG-39 1,600 x 10 -6 1,5 2,400 x 10 -6 -5,609 x 10 -8 -2,047 x 10 -5 -5,118 x 10 -6 SG-33 1,440 x 10 -6 3 4,320 x 10 -6 -1,010 x 10 -7 -3,685 x 10 -5 -9,213 x 10 -6 SG-26 1,040 x 10 -3 2 2,080 x 10 -6 -4,861 x 10 -5 -1,790 x 10 -2 -4,475 x 10 -3 SG-38 1,440 x 10 -6 1 1,440 x 10 -6 -3,365 x 10 -8 -1,228 x 10 -5 -3,071 x 10 -6 SG-23 2,640 x 10 -3 2 5,280 x 10 -3 -1,234 x 10 -4 -4,607 x 10 -2 -1,152 x 10 -2 SG-25 3,600 x 10 -4 1,5 5,400 x 10 -4 -1,262 x 10 -5 -4,617 x 10 -3 -1,154 x 10 -3 SG-21 1,360 x 10 -4 2,5 3,400 x 10 -4 -7,946 x 10 -6 -2,904 x 10 -3 -7,261 x 10 -4 SG-16 8,800 x 10 -6 2 1,760 x 10 -5 -4,113 x 10 -7 -1,501 x 10 -4 -3,753 x 10 -5 SG-32 6,240 x 10 -6 1,5 9,360 x 10 -6 -2,187 x 10 -7 -7,984 x 10 -5 -1,996 x 10 -6 SG-12 1,440 x 10 -6 2 2,880 x 10 -6 -6,731 x 10 -8 -2,457 x 10 -5 -6,142 x 10 -6 SG-04 1,600 x 10 -6 1 1,600 x 10 -6 -3,739 x 10 -8 -1,365 x 10 -5 -3,412 x 10 -6 Sumber: Hasil Perhitungan, 2022. Kelangsungan hidup bakteri E. coli mempresentasikan risiko kesehatan, oleh karena itu sumber air tanah sangat perlu untuk dilakukan pengembangan QMRA untuk memastikan kesehatan manusia yang memadai dan terbebas dari patogen yang menular (Latchmore et al, 2022). Dari Tabel 7, dapat dilihat bahwa nilai Pinf/day/Pill dari 11 contoh air sumur yang sudah diujikan memiliki nilai Pinf/day/Pill> 10 -6 , oleh karena itu 11 contoh air tersebut termasuk dalam kategori risiko tinggi terkena penyakit diare.…”