What pH Level Is the Best Water to Drink? (Chart, Tap Water pH & Indio)
Quick Summary: The best pH for drinking water is between 6.5 and 8.5, the range the EPA recommends for public water systems, and anything close to neutral (7.0) is ideal. Water at 7.2, 7.4 or 7.8 is all well within that window and perfectly good to drink. In Indio, groundwater from the Coachella Valley aquifer typically runs slightly alkaline, so most local tap water already lands in the healthy range. What matters more for your health is what else is in the water, which a free Culligan water test can tell you.
The best pH level for drinking water is between 6.5 and 8.5. That is the range the U.S. Environmental Protection Agency (EPA) recommends for public water supplies, and water anywhere near neutral (7.0) is ideal for taste, for your plumbing and for your health. If your tap water tests at 7.2, 7.4 or 7.8, you are in good shape. Here in Indio and across the Coachella Valley, groundwater from our local aquifer tends to run slightly on the alkaline side of neutral, so most homes already fall inside that window.
Below, we explain what pH actually measures, what is normal for Indio tap water, whether specific readings like 7.8 are good to drink, how reverse osmosis and alkaline water change pH, and how to test and adjust the water in your own home.
What pH Level Is Best for Drinking Water?
pH is a measure of how acidic or basic (alkaline) a liquid is, on a scale from 0 to 14. Pure water sits at 7.0, which is neutral. Readings below 7 are acidic; readings above 7 are alkaline. The scale is logarithmic, so water at pH 6 is ten times more acidic than water at pH 7, and pH 5 is a hundred times more acidic.
For drinking water, the EPA sets pH as a secondary standard, with a recommended range of 6.5 to 8.5. Secondary standards are not enforceable health limits. They cover the things that affect taste, odor, appearance and plumbing. The EPA does not regulate pH as a health contaminant because, within the range found in nearly all public water systems, pH on its own does not make water unsafe to drink. The World Health Organization takes the same view and has no health-based guideline value for pH.
So the honest answer to what pH water is best to drink is: anything from about 6.5 to 8.5, with a slight preference for water close to neutral or a little above it. Your body keeps your blood tightly regulated at about 7.35 to 7.45 no matter what you drink, so you do not need to chase a specific number. What matters is that the pH is stable and that the water is free of contaminants that a pH reading will never reveal.
Why pH outside that range causes problems
- Below 6.5 (acidic): Water becomes corrosive. It can leach copper, lead and other metals from pipes and fixtures, leaving blue-green stains in sinks and tubs and a metallic taste. Acidic water shortens the life of water heaters and appliances.
- Above 8.5 (alkaline): Water can taste bitter or soda-like, leave more scale on fixtures and feel slippery. Very alkaline water can also make chlorine disinfection less effective at the treatment plant.
Either extreme is unusual in a municipal supply. If you are seeing stains, odd tastes or corrosion at home, the cause is more often hardness, chlorine or a metal in the water than pH itself. Our guide to pH problems in household water walks through the warning signs.
What Is the pH of Tap Water in Indio?
Indio does not have a single water pH because the Coachella Valley is served by several utilities. The Indio Water Authority (IWA) serves the city of Indio, the Coachella Valley Water District (CVWD) serves much of the rest of the valley including La Quinta, Palm Desert and Coachella, and the Desert Water Agency (DWA) serves Palm Springs. All of them draw primarily on groundwater pumped from the Coachella Valley aquifer, which is replenished in part with imported Colorado River water.
Groundwater that spends years moving through desert soils and rock picks up dissolved calcium, magnesium and bicarbonate. Those minerals buffer the water and push it slightly above neutral, so local tap water is typically mildly alkaline, comfortably within the EPA’s 6.5 to 8.5 range. The exact reading varies by well and by season, and your utility publishes it each year in its Consumer Confidence Report. For a number specific to your home, a test at the tap is the only reliable way to know.
The same minerals that raise pH also make our water very hard. Indio water averages roughly 250 to 300 ppm of hardness (about 15 to 17 grains per gallon), which is why scale on faucets, spotty dishes and dry skin are far more common complaints here than anything pH-related. If those sound familiar, hardness, not pH, is the issue to address first.
Is 7.8 pH Water Good to Drink?
Yes. A pH of 7.8 is good drinking water. It is slightly alkaline, well inside the recommended range, and typical of mineral-rich groundwater like ours. Many bottled spring waters test at or near 7.8. There is no health reason to lower it, and no meaningful benefit to raising it.
Because so many readers arrive here after testing their own water, here is how the most common readings stack up:
| Your reading | What it means | Good to drink? |
|---|---|---|
| 6.5 to 6.9 | Slightly acidic. Common for RO, distilled and some bottled purified waters. | Yes. Watch for corrosion if this is untreated well water. |
| 7.0 | Neutral. The pH of pure water. | Yes. Ideal. |
| 7.2 | Just above neutral. Very common for treated municipal water. | Yes. Ideal. |
| 7.4 | Slightly alkaline. Matches the pH of human blood. | Yes. Ideal. |
| 7.8 | Mildly alkaline. Typical of hard groundwater. | Yes. Completely normal. |
| 8.0 to 8.5 | Alkaline. Upper end of the EPA range; may taste slightly flat or soapy. | Yes. Fine to drink. |
| Above 8.5 or below 6.5 | Outside the recommended range. | Usually still safe, but worth a professional test to find out why. |
A pH of 7.8 is not a problem to fix. It is a normal reading for mineral-rich groundwater like ours in the Coachella Valley, and it sits comfortably inside the range the EPA recommends.
The short version: if your water is anywhere between 7.2 and 7.8, stop worrying about pH and turn your attention to what else the test shows.
pH of Common Drinking Waters (Chart)
Different types of water land at different points on the scale, mostly because of how much dissolved mineral content they carry. These are typical ranges, and individual brands and sources will vary:
| Type of water | Typical pH | Why |
|---|---|---|
| Municipal tap water (Indio and Coachella Valley) | Slightly alkaline, within 6.5 to 8.5 | Mineral-rich groundwater buffered by calcium, magnesium and bicarbonate. |
| Reverse osmosis (RO) water | 5.0 to 7.0 | RO removes the buffering minerals, so dissolved carbon dioxide nudges pH down. |
| Distilled water | About 5.5 to 7.0 | Starts neutral, then absorbs CO2 from the air and turns mildly acidic. |
| Bottled purified water | 5.0 to 7.0 | Usually RO or distilled, sometimes with a small amount of minerals added back. |
| Spring water | 6.5 to 8.5 | Reflects the rock it flowed through; most brands test between 7 and 8. |
| Alkaline bottled water | 8.0 to 9.5 | Minerals or electrolytes added, or ionized, to raise pH on purpose. |
| Sparkling or carbonated water | 3.0 to 4.0 | Dissolved carbon dioxide forms carbonic acid. |
| Well water | Varies widely, often 6.0 to 8.5 | Depends entirely on local geology; desert wells tend toward alkaline. |
For perspective, black coffee is around pH 5, orange juice around 3.5 and most sodas around 2.5 to 3.5. Every water on the chart above, including sparkling water, is far gentler than the drinks many of us have daily.
Does Reverse Osmosis Lower Water pH?
Yes, slightly. A reverse osmosis drinking water system pushes water through a membrane fine enough to remove dissolved solids, including the calcium and magnesium that buffer pH. Once those minerals are gone, the small amount of carbon dioxide naturally dissolved in the water has more influence, and the result is RO water that typically tests between pH 5 and 7.
That mild acidity is completely safe to drink. The EPA does not treat pH as a health concern at these levels, and RO water is far less acidic than coffee, juice or soda. It is also the trade-off for what RO removes: lead, arsenic, chromium-6, nitrates, PFAS, fluoride and most of the dissolved solids that give Indio water its taste. In a very hard-water area like the Coachella Valley, RO also delivers a noticeably cleaner, lighter-tasting glass of water.
How much the pH drops depends on a few things
- Starting pH. Slightly alkaline source water, like ours, generally ends up closer to neutral after RO than water that started acidic.
- Mineral content. The more dissolved minerals removed, the more the buffering capacity drops. Very hard water can see a bigger swing.
- System performance. A high-efficiency multi-stage system produces purer, and therefore less buffered, water.
- Air exposure. RO water left in an open pitcher absorbs CO2 and drifts a little lower over time.
Remineralization: raising RO pH if you want to
Most households never need to adjust RO water. But if you prefer a rounder taste, or use RO water for coffee, aquariums or plants, a remineralization (or alkaline) cartridge added after the membrane puts a measured dose of calcium and magnesium back in. That restores buffering, brings pH back toward neutral or slightly above, and improves taste without giving up the contaminant removal. Ask Culligan of Indio about remineralization options when you schedule your water test.
Is Alkaline Water Better for You?
Alkaline water, usually pH 8 to 9.5, is marketed for hydration, energy and neutralizing acid in the body. The evidence for those claims is limited. Your stomach is strongly acidic (around pH 1.5 to 3.5), so any water you drink is neutralized almost immediately, and your kidneys and lungs keep your blood pH in its narrow healthy band regardless of what you swallow.
That does not make alkaline water bad. It is safe for healthy adults, and some people simply prefer the smoother taste that added minerals give it. Just know that the same minerals are already present in Indio tap water, which is naturally on the alkaline side, and that pH says nothing about whether the water is free of contaminants. We break down the local angle in our guide to alkaline water in Indio.
If you have kidney disease or take medications that affect mineral balance, check with your doctor before drinking large amounts of high-pH water.
How to Test and Adjust Your Water’s pH
Testing
- pH test strips. Inexpensive and fast, accurate to about half a point. Good for a quick check on tap, RO or pitcher water.
- Digital pH meter. More precise (to a tenth of a point) if you calibrate it. Useful if you are dialing in RO water for coffee or plants.
- Your utility’s Consumer Confidence Report. IWA, CVWD and DWA each publish annual pH ranges for the system as a whole.
- A professional in-home test. Culligan of Indio’s free in-home water test checks pH alongside hardness, chlorine, total dissolved solids and other factors that actually affect taste and plumbing, and explains what the results mean for your home.
Adjusting
- Acidic water (below 6.5): A calcite neutralizing filter slowly dissolves calcium carbonate into the water to raise pH. This is mainly a private-well fix and is rarely needed on municipal water in the Coachella Valley.
- Alkaline water (above 8.5): Uncommon in homes here. Acid injection systems exist but are almost never warranted for residential use; a water test usually points to hardness or TDS as the real complaint.
- RO water you want closer to neutral: Add a remineralization cartridge, as described above.
- Normal readings (6.5 to 8.5): Leave the pH alone and focus on treating hardness, taste or specific contaminants.
Because the right fix depends on your water, we do not quote system pricing sight unseen. The free water test comes first; from there we can recommend a drinking water system, a softener, or both, with pricing that fits your home.
Frequently Asked Questions
Is 7.2 pH good for drinking water?
Yes. A pH of 7.2 is just above neutral and about as ideal as drinking water gets. It is a very common reading for treated municipal water.
Is water with a pH of 7.4 the healthiest?
It is excellent, but not uniquely so. The 7.4 figure gets attention because it matches human blood pH. Your body holds blood at that level on its own, so water at 7.0 or 7.8 is just as healthy.
Can drinking water with the wrong pH make you sick?
Within the 6.5 to 8.5 range found in essentially all public water systems, no. The real risk from very low pH is indirect: acidic water can pull lead and copper out of plumbing, and those metals are the health concern, not the pH itself.
Does a water softener change pH?
Very little. A softener swaps calcium and magnesium for sodium or potassium and leaves the water’s buffering capacity mostly intact, so pH stays about where it started. That is different from reverse osmosis, which removes the minerals altogether.
What pH should my RO water be?
Anywhere from 5 to 7 is normal and safe. If you want it closer to 7 or slightly above for taste, add a remineralization cartridge rather than drops or additives.
The Bottom Line on Drinking Water pH
The best pH for drinking water is anything from 6.5 to 8.5, and readings of 7.2, 7.4 and 7.8 are all ideal. Indio’s groundwater naturally lands on the slightly alkaline side of that range, so pH is rarely the problem in a Coachella Valley home. Hardness, chlorine taste and dissolved solids are far more likely culprits, and none of them show up on a pH strip. A free in-home water test from Culligan of Indio tells you exactly where your water stands and what, if anything, is worth treating.
