There wouldn't be many who think California Water Service Group's (NYSE:CWT) price-to-earnings (or "P/E") ratio of 18.5x is worth a mention when the median P/E in the United States is similar at about 18x. While this might not raise any eyebrows, if the P/E ratio is not justified investors could be missing out on a potential opportunity or ignoring looming disappointment.

Recent times have been pleasing for California Water Service Group as its earnings have risen in spite of the market's earnings going into reverse. One possibility is that the P/E is moderate because investors think the company's earnings will be less resilient moving forward. If you like the company, you'd be hoping this isn't the case so that you could potentially pick up some stock while it's not quite in favour.

If you'd like to see what analysts are forecasting going forward, you should check out our free report on California Water Service Group.

How Is California Water Service Group's Growth Trending?

There's an inherent assumption that a company should be matching the market for P/E ratios like California Water Service Group's to be considered reasonable.

Retrospectively, the last year delivered an exceptional 167% gain to the company's bottom line. However, the latest three year period hasn't been as great in aggregate as it didn't manage to provide any growth at all. So it appears to us that the company has had a mixed result in terms of growing earnings over that time.

Looking ahead now, EPS is anticipated to slump, contracting by 3.6% each year during the coming three years according to the three analysts following the company. With the market predicted to deliver 10% growth each year, that's a disappointing outcome.

With this information, we find it concerning that California Water Service Group is trading at a fairly similar P/E to the market. Apparently many investors in the company reject the analyst cohort's pessimism and aren't willing to let go of their stock right now. Only the boldest would assume these prices are sustainable as these declining earnings are likely to weigh on the share price eventually.

What We Can Learn From California Water Service Group's P/E?

It's argued the price-to-earnings ratio is an inferior measure of value within certain industries, but it can be a powerful business sentiment indicator.

We've established that California Water Service Group currently trades on a higher than expected P/E for a company whose earnings are forecast to decline. When we see a poor outlook with earnings heading backwards, we suspect share price is at risk of declining, sending the moderate P/E lower. Unless these conditions improve, it's challenging to accept these prices as being reasonable.

You should always think about risks. Case in point, we've spotted 2 warning signs for California Water Service Group you should be aware of.

Of course, you might also be able to find a better stock than California Water Service Group. So you may wish to see this free collection of other companies that have reasonable P/E ratios and have grown earnings strongly.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team@simplywallst.com