Is Tap Water or Spring Water Good for Plants?

Tap water is usually safe for your plants.

Tap Water Is Generally OK

Unless you have softened water, tap water is usually fine for watering plants. University cooperative extension offices warn that water treated by a water softener is not good for plants because it may contain high levels of sodium, although there are ways to counteract that. Also, plants like lucky bamboo are sensitive to the chlorine and fluoride in municipal water systems.

Spring Water Is Costly

Spring water also works well for plants. If you are watering a few houseplants, this is a viable option. But using spring water for garden plants or a houseful of plants will quickly add up in price.

Bottom Line

Water your plants with tap water. Even if you have softened water, you can apply gypsum twice a year to your soil to counteract the sodium build-up. However, if you notice your plants' foliage turning yellow and you are taking good care of your plants in general, consider having your water tested to determine its contents.

References

• University of Arizona: Water for Irrigation
• Gardens Alive: Special Tips on Winter Houseplant Care
• Texas A&M University: Hard Water
• University of California Cooperative Extension: Example Indoor Plant Care Instructions

Resources

• Enviornmental Protection Agency: State Certification Officers for Drinking Water Laboratories