Hi all…nitrate and nitrate in drinking water have been regulated for quite some time now (Health Canada guidelines: MAC = 10 mg/L measured as nitrate-nitrogen and 1 mg/L measured as nitrite-nitrogen). The primary concern which led to regulations/guidelines is methaemoglobinemia and not a cancer endpoint. A recent study concludes long-term ingestion of elevated nitrate in drinking water [...]
Hi all…The USEPA released a report in Feb 2017 entitled “Sampling Guidance for Unknown Contaminants in Drinking Water.” If you’re like me, it’s one of those reports that probably won’t make it to the top of your reading list until you really need it. You can save some time during a contamination event by downloading it [...]
Hi all…do you want to know how guidelines/standards in your jurisdiction compare to those of the WHO? Well the WHO has recently revised several drinking water related guidelines and they are all available for free download as indicated below. And on the topic of drinking water guidelines, Health Canada has one active request for public [...]
Hi all…for several decades now it has been known that phosphorus reduction is good way to control microcystis blooms (the cyanobacteria that produce the regulated microcystin-LR toxin). However, a recent article reports that “an excess of another nutrient, nitrogen, shifts the balance in favor of Microcystis rather than other HAB-forming cyanobacteria, diatoms, or green algae.” This article is open [...]
For several decades now it has been known that phosphorus reduction is good way to control microcystis blooms (the cyanobacteria that produce the regulated microcystin-LR toxin). However, a recent article reports that “an excess of another nutrient, nitrogen, shifts the balance in favor of Microcystis rather than other HAB-forming cyanobacteria, diatoms, or green algae.”
Hi all…for those of you who deal with raw water reservoirs or lakes that are under threat from cyanobacterial blooms (potentially associated with the regulated microcystin LR) you may find this article interesting. It doesn’t go too deeply into each of the issues it identifies but it does touch on a fair number of topics [...]
For those of you who deal with raw water reservoirs or lakes that are under threat from cyanobacterial blooms (potentially associated with the regulated microcystin LR) you may find this article interesting...
Hi all…the USEPA’s Contaminant Candidate List 4 (CCL 4) was finalized November 17, 2016. The CCL is a list of contaminants that are currently not subject to any proposed or promulgated national primary drinking water regulations, but are known or anticipated to occur in public water systems. Contaminants listed on the CCL may require future regulation [...]
The USEPA’s Contaminant Candidate List 4 (CCL 4) was finalized November 17, 2016. The CCL is a list of contaminants that are currently not subject to any proposed or promulgated national primary drinking water regulations, but are known...
Hi all…the Water Research Foundation has just released a report entitled “A Methodology for Locating and Managing Dynamic Potential Source Water Contaminant Data – Project 4581.” “The purpose of the project was to develop and demonstrate a methodology for identifying potential sources of contamination upstream of drinking water intakes, particularly from above ground storage tanks [...]
