Signs Your Water Is Acidic
- Blue-green stains in sinks, tubs, toilets and under faucets — that's copper being dissolved out of your pipes.
- Pinhole leaks in copper plumbing, often years before you'd expect.
- A metallic or sour taste, especially first thing in the morning after water has sat in the pipes overnight.
- Faucets, valves and water heaters wearing out early.
- An iron or arsenic filter that isn't working as well as it should — many treatment systems need the right pH to do their job.
What pH Means — In Plain English
pH measures how acidic or alkaline water is on a scale of 0 to 14. 7 is neutral. Below 7 is acidic; above 7 is alkaline. The EPA recommends drinking water stay between 6.5 and 8.5.
The scale is logarithmic, so each step is ten times stronger: water at pH 6 is 10 times more acidic than pH 7, and pH 5 is 100 times more acidic.
| pH 5 Very corrosive |
pH 6 Corrosive |
pH 6.5 EPA minimum |
pH 7–7.5 Target |
pH 8.5+ Scale-forming |
How Common Is Acidic Water Here?
Very. A University of Maryland study of private wells in Queen Anne's, Kent, Cecil and Montgomery counties found:
| 26%of wells were outside the EPA's recommended pH range | 84%of those were too acidic — below pH 6.5 |
In other words, roughly one in five wells tested was acidic enough to fall below the recommended range.
Why Shore & Anne Arundel Water Runs Acidic
Sandy aquifers with little natural buffering
Unlike limestone country, much of our Coastal Plain is made of quartz sand and clay that do little to neutralize acid. Rain picks up carbon dioxide from the air and from decaying plants in the soil, becoming mildly acidic before it ever reaches the aquifer — and in sandy layers there's not much to bring the pH back up.
It depends on your aquifer
Aquifers with shell material — like parts of the Aquia — tend to have harder, more neutral water. Shallow wells and sand-dominated aquifers often run soft and acidic. That's why one neighbor fights hard water while the next fights blue-green stains.
Northern Anne Arundel: acidic water and radium
Radium, a naturally occurring radioactive metal, dissolves more easily in acidic groundwater. The Maryland Department of the Environment found elevated radium concentrated in the Magothy and Patapsco aquifers of northern Anne Arundel County, linked to low pH — and by the end of 1999, 63% of the 515 wells tested there exceeded the radium standard. The county now requires gross alpha testing for new and replacement wells north of Route 50 and encourages existing owners to test.
Is Acidic Water Dangerous?
Low pH itself isn't the health concern — what it dissolves is. Acidic water pulls metals out of your plumbing and into the water you drink:
- Lead from older solder, brass fixtures and fittings. There's no safe level of lead, and children are most at risk.
- Copper from pipes. Above 1.3 mg/L it can cause stomach cramps and nausea; above 1.0 mg/L it causes staining and taste problems.
- Radium in parts of northern Anne Arundel County, as described above.
What Acidic Water Does to Your Home
- Pinhole leaks in copper lines — sometimes inside walls and ceilings, where water damage goes unnoticed.
- Shorter life for water heaters, pumps, fixtures and appliances.
- Blue-green stains on porcelain, tile and grout, and sometimes on blonde hair.
- Other treatment underperforms. Many iron filters need neutral pH to work, and pH affects how well some arsenic media perform.
pH Correction Options, Compared
| Option | Best for | Good to know |
|---|---|---|
| Calcite acid neutralizer | Mildly acidic water. Crushed limestone dissolves slowly as water flows through, raising pH toward neutral without overcorrecting. | Media is used up and needs periodic refills. Adds some hardness. |
| Calcite + magnesium oxide blend | More acidic water that calcite alone can't fully correct. | Works faster and stronger; needs careful sizing so it doesn't overshoot. Adds hardness. |
| Soda ash injection | Very acidic water, or homes that don't want added hardness. | A small pump feeds a solution into the water. No pressure loss and no added hardness; needs solution refills and adds some sodium. |
| Reverse osmosis at the kitchen tap | Removing lead and copper from drinking water. | Protects what you drink but doesn't stop corrosion in the rest of the plumbing. |
Heads-up on hardness: calcite and magnesium media raise pH by adding minerals, so very acidic water can come out moderately hard. Sometimes a softener after the neutralizer is the right pairing — we'll tell you if yours needs one.
How Lifewell Corrects pH
| 1 | Test pH at your tap. Plus hardness, iron, TDS and more — and lead, copper or gross alpha testing when your home or location calls for it. |
| 2 | Pick the right method. Calcite, a blend or soda ash depending on how acidic your water is and whether added hardness matters. |
| 3 | Install it in the right spot. pH correction goes ahead of iron, arsenic and other filters that depend on it. |
| 4 | Target pH 7.0–7.5. Enough to stop corrosion without pushing into scale-forming territory. |
| 5 | Keep it working. Media top-offs and retesting so protection doesn't fade as the media dissolves. |
Why Shore & Anne Arundel Homeowners Call Lifewell
- Based in Queenstown, serving Kent Island, Queen Anne's, Talbot, Kent, Caroline and Dorchester counties, plus Annapolis, Severna Park and Edgewater.
- Master plumber–owned. We can fix the pinhole leaks and corroded fixtures acidic water already caused — not just the water.
- Whole-system design. pH, iron, hardness and arsenic planned together, in the right order.
- Honest recommendations and ongoing maintenance so your neutralizer never quietly runs empty.
Frequently Asked Questions
What causes blue-green stains in my sink?
Blue-green stains are copper dissolved from your pipes by acidic (low pH) water. They're a sign your water is corrosive and that copper, and possibly lead, may be getting into your drinking water.
How common is acidic well water in Maryland?
A University of Maryland study of private wells in Queen Anne's, Kent, Cecil and Montgomery counties found 26% were outside the EPA's recommended pH range, and most of those were too acidic.
What pH should well water be?
The EPA recommends 6.5 to 8.5. We typically target about 7.0 to 7.5, which stops corrosion without causing scale.
Is acidic water safe to drink?
Low pH itself isn't the main concern. The risk is the lead and copper it dissolves from plumbing. If your water is acidic, get a first-draw lead and copper test and run the cold tap for a minute before drinking when water has been sitting.
Is there radium in Anne Arundel County well water?
In parts of northern Anne Arundel County, yes. The Maryland Department of the Environment found elevated radium in the Magothy and Patapsco aquifers there, associated with acidic water. The county encourages gross alpha testing, and softeners or reverse osmosis can remove radium.
How does an acid neutralizer work?
Water flows through a tank of calcite (crushed limestone), sometimes blended with magnesium oxide. The media slowly dissolves, raising pH toward neutral. It's used up over time and needs periodic refills.
Will an acid neutralizer make my water hard?
It adds some hardness, since it raises pH by dissolving minerals. For very acidic water that can be noticeable, so a softener afterward may help. Soda ash injection corrects pH without adding hardness.
Why isn't my iron filter working?
Low pH is a common culprit. Many iron filter media need near-neutral pH to remove iron, so acidic water often needs correction ahead of the iron filter.
How often does neutralizer media need refilling?
It depends on how acidic your water is and how much you use, typically every 6 to 18 months. Media that runs low lets acidic water through again.
Do you serve my town?
We serve Queenstown, Stevensville, Kent Island, Grasonville, Centreville, Chestertown, Easton, St. Michaels, Denton, Cambridge, Salisbury and surrounding Eastern Shore communities, plus Annapolis, Severna Park, Edgewater and well-served areas of Anne Arundel County.
Stop the Blue-Green Stains
Get your water's pH tested and we'll show you exactly what's happening in your pipes — and only recommend what your water needs.
Sources
- Murray et al., University of Maryland — Prevalence of Microbiological and Chemical Contaminants in Private Drinking Water Wells in Maryland (2018)
- Maryland Department of the Environment — Radium in Drinking Water: A Homeowner's Guide
- Anne Arundel County Department of Health — Water Quality Problem Areas
- Penn State Extension — Corrosive Water Problems
- Maryland Geological Survey — Hardness in Coastal Plain groundwater
This page is general information, not medical advice. If you're concerned about lead or radium exposure, talk to your doctor.