Monarto (South Australia) – Trihalomethanes
Breaches to Australian Drinking Water Guidelines Levels Only
19/02/2009 Monarto Zion Lutheran Church Schenscher Rd Trihalomethanes – Total 281 ug/L
17/02/2011 Monarto Zion Lutheran Church Schenscher Rd Trihalomethanes – Total 362 ug/L
16/03/2011 Monarto Zion Lutheran Church Schenscher Rd Trihalomethanes – Total 297 ug/L
8/03/2012 Monarto Zion Lutheran Church Schenscher Rd Trihalomethanes – Total 292 ug/L
5/04/2012 Monarto Zion Lutheran Church Schenscher Rd Trihalomethanes – Total 251 ug/L
4/05/2012 Monarto Zion Lutheran Church Schenscher Rd Trihalomethanes – Total 266 ug/L
31/05/2012 Monarto Zion Lutheran Church Schenscher Rd Trihalomethanes – Total 252 ug/L
Trihalomethanes Australian Guideline Level 250μg/L (0.25mg/L)
Why and how are THMs formed?
“When chlorine is added to water with organic material, such as algae, river weeds, and decaying leaves, THMs are formed. Residual chlorine molecules react with this harmless organic material to form a group of chlorinated chemical compounds, THMs. They are tasteless and odourless, but harmful and potentially toxic. The quantity of by-products formed is determined by several factors, such as the amount and type of organic material present in water, temperature, pH, chlorine dosage, contact time available for chlorine, and bromide concentration in the water. The organic matter in water mainly consists of a) humic substance, which is the organic portion of soil that remains after prolonged microbial decomposition formed by the decay of leaves, wood, and other vegetable matter; and b) fulvic acid, which is a water soluble substance of low molecular weight that is derived from humus”. Source: https://water.epa.gov/drink/contaminants/in
Monarto (South Australia) – Bromodichloromethane
2022/23: Monarto (South Australia) Bromodichloromethane 89ug/L (max), 60.89ug/L (av. 2022/23)
2023/24: Monarto (South Australia) Bromodichloromethane 66ug/L (max), 53.45ug/L (av. 2023/24)
2024/25: Monarto (South Australia) Bromodichloromethane 64ug/L (max), 51.25ug/L (av. 2024/25)
WHO Guideline level BDCM: 60ug/L (Australian Guideline for BDCM is included in the Trihalomethane (THM) combined total of BDCM, Chloroform, Dibromochloromethane and Bromoform. THM guideline is 250ug/L)
“Carcinogenicity : Bromodichloromethane is reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity from studies in experimental animals.
Cancer Studies in Experimental Animals: Oral exposure to bromodichloromethane caused tumors at several different tissue sites in mice and rats. Administration of bromodichloromethane by stomach tube caused benign and malignant kidney tumors (tubular-cell adenoma and adenocarcinoma) in male mice and in rats of both sexes, benign and
malignant liver tumors (hepatocellular adenoma and carcinoma) in female mice, and benign and malignant colon tumors (adenomatous polyps and adenocarcinoma) in rats of both sexes (NTP 1987, ATSDR 1989, IARC 1991, 1999).
Monarto (South Australia) – Chloral Hydrate
14/4/10 Monarto Chloral Hydrate 21.7ug/L
2/6/10 Monarto Chloral Hydrate 23ug/L
9/6/10 Monarto Chloral Hydrate 36.7ug/L
30/6/10 Monarto Chloral Hydrate 26.7ug/L
7/7/10 Monarto Chloral Hydrate 26.6ug/L
27/10/10 Monarto Chloral Hydrate 23.8ug/L
21/10/11 Monarto Chloral Hydrate 28.7ug/L
16/12/11 Monarto Chloral Hydrate 24.5ug/L
10/2/12 Monarto Chloral Hydrate 22.4ug/L
Chloral hydrate is a disinfection by-product, arising from chlorination of water containing naturally occurring organic material (NOM). Chloral hydrate is a sedative and hypnotic drug. Long-term use of chloral hydrate is associated with a rapid development of tolerance to its effects and possible addiction as well as adverse effects including rashes, gastric
discomfort and severe renal, cardiac and hepatic failure.
2004 Australian Drinking Water Guideline: Trichloroacetaldehyde (chloral hydrate): 0.02mg/L
2011 Australian Drinking Water Guideline: Trichloroacetaldehyde (chloral hydrate): 0.1mg/L