Chaffey Dam has crept past the 80 per cent full milestone, after a drastic rise in the month of June.

The source is now holding almost 83,000ML of water, which is enough to fill an Olympic swimming pool more than 33,200 times.

It gives the city greater water security, and if residents consume about 20ML per day, what the dam is holding now is enough water for more than 4000 days.

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That's not an accurate reflection though, as water in Chaffey Dam is not all for Tamworth and is shared among a number of stakeholders.

The last time the source was at 80 per cent was three-and-a-half years ago in January 2018. But, it only took two years for the water level to drop to a meagre 12 per cent as the drought raged on.

The supply has risen by more than 20 per cent this month alone after heavy rain and snow fell in the catchment.

It only needs to rise by that amount again before it hits capacity and water starts splashing down the spillway.

More than 125mm of rain fell in Tamworth in June, according to data from the Bureau of Meteorology, which is more than four times the amount that fell in the same month last year.

Water has largely stayed plugged up in Chaffey Dam, with water for Tamworth still being sourced from Dungowan Dam and the Peel River.

Some large releases were seen at the start of the month but have since dropped back to the standard 3ML per day for environmental reasons.