ASX dividend stocks are companies that distribute regular cash payments to their shareholders.

Depending on an investor's risk tolerance, a variety of sectors offer dividend-paying stocks, ranging from banking and telecommunications to infrastructure and mining.

However, for investors seeking a reliable source of passive income for the long term, focusing on well-established and financially stable companies is essential.

Here are two such stocks that meet these criteria.

APA Group (ASX: APA)

APA stands out as one of the most dependable dividend-paying shares on the ASX. This energy infrastructure enterprise is renowned for providing strong and consistent dividends, supported by revenue from its portfolio of long-term contracted assets.

The company has maintained a bi-annual dividend schedule, making payments in March and September since 2016, with a history of dividend distributions stretching back to 2008.

Not only has APA delivered reliable dividends over an extended period, but it has also increased its payout annually for the past two decades.

Its dividend yield is typically significantly higher than many other ASX dividend stocks, making it an attractive choice for those focused on long-term passive income.

In the first half of FY26, the company distributed an interim dividend of 27.5 cents and has provided guidance for a full-year dividend of 58 cents per security. Based on current figures, this represents a forward distribution yield of 5.8%, partially franked.

Telstra Group Ltd (ASX: TLS)

A key advantage of telecommunications provider Telstra is its status as a classic defensive asset. This implies that its services remain essential for Australians, irrespective of high inflation, rising living costs, or global economic uncertainty.

This type of stock is also ideal for investors looking to mitigate potential volatility in other parts of their investment portfolio.

As a reliable and steady ASX dividend stock, Telstra offers investors a solid stream of passive income. The company's dividend payout ratio is notably high, approaching 100% of its earnings.

Since 2016, Telstra has paid two dividends per year, typically in March and September, occasionally supplemented by special dividend payments. The company has a long track record of rewarding shareholders, with dividend payments dating back to 2004.

Last month, shareholders received an interim dividend of 10.5 cents, which was 90.48% franked. For FY26, Telstra has forecast a total dividend payment of 20 cents per share.

For the previous financial year (FY25), the company paid an annual dividend of 19 cents per share. At current levels, this equates to a dividend yield of approximately 3.5%.