The NSW Water website shows no Algal Alerts for Lake Chaffey at this time. Algal conditions are monitored by Regional Algal Committees and they issue alerts if required. As Lake Chaffey is the prmary source of Tamworth drinking water I would think it is closely watched. Here is the link to the Algal ALert page:
http://www.water.nsw.gov.au/Water-ma...n/default.aspx