The most effective ways to lower acidity in cat urine involve dietary changes, increased water intake, and in some cases a supplement called potassium citrate. Normal cat urine pH falls between 6.3 and 6.6, and urine that stays consistently below 6.0 creates real health risks, most notably calcium oxalate crystals and stones that can cause pain, urinary blockages, and emergency situations.
Before making changes, it helps to understand why overly acidic urine is a problem and which strategies actually work, so you can have an informed conversation with your vet and take practical steps at home.
Why Acidic Urine Is a Problem
Calcium oxalate stones, the most common type of stone in cats today, form when urine pH drops below about 6.8. Acidifying diets are one of the most prominent risk factors. When urine stays too acidic for too long, the body compensates by pulling calcium from bone, which raises the amount of calcium being filtered through the kidneys and dumped into urine. At the same time, acidic urine lowers levels of citrate, a natural compound that normally binds to calcium and keeps it from forming crystals. It also impairs other protein-based inhibitors that would otherwise prevent stones from clumping together.
The consequences can be serious. Calcium oxalate crystals in urine mean the urine is supersaturated, and persistent supersaturation increases the risk of actual stone formation. Stones can cause signs of lower urinary tract disease, and in male cats especially, they can lead to urethral obstruction. A blocked cat can develop dangerous electrolyte imbalances, kidney failure, and dehydration rapidly.
Switch to a Moderate-Protein, Wet Food Diet
Diet is the single biggest lever you have. Two factors matter most: protein concentration and moisture content.
High-protein diets push urine pH down. In one study, cats fed a high-protein diet (55% crude protein on a dry matter basis) had a urinary pH of 6.63, while cats eating a moderate-protein version (29% crude protein) from the same protein sources had a urinary pH of 7.25. That’s a meaningful shift. The protein source matters too. Diets based on meat meal produced the highest urinary pH (7.99 in one trial), while plant-based proteins like corn gluten meal produced lower values (7.08). So a moderate-protein diet with quality animal protein sources tends to produce less acidic urine than a high-protein or heavily plant-based formula.
Moisture content is the other critical piece. Cats fed wet food (around 82% moisture) produced significantly more urine and had much more dilute urine compared to cats on dry food. Urine specific gravity, a measure of concentration, dropped from around 1.059 on dry food to 1.028 on wet food. More dilute urine means lower concentrations of the minerals that form crystals and stones. If your cat currently eats only dry kibble, transitioning to wet food or adding water to meals is one of the most straightforward changes you can make.
Increase Total Water Intake
Beyond switching to wet food, encouraging your cat to drink more water helps dilute urine and reduce the supersaturation that leads to crystal formation. Strategies that work for most cats include placing multiple water bowls around the house, using a pet water fountain (many cats prefer running water), and keeping water fresh and clean daily.
Adding water directly to food is also effective. In research comparing different approaches, cats eating wet diets had the highest total water intake and the highest urine volume. Cats eating dry food with added water fell somewhere in between, while cats on plain dry food had the lowest water intake and most concentrated urine. Even small increases in daily water consumption can meaningfully change urine concentration over time.
Potassium Citrate as a Supplement
When dietary changes alone don’t bring urine pH up enough, potassium citrate is the standard supplement veterinarians use. It works in two ways: it raises urine pH directly, and it increases citrate levels in urine. Citrate binds calcium so less of it is available to pair with oxalate, and it also reduces the tendency of existing crystals to clump together into stones.
The University of Minnesota’s Urolith Center, a leading resource for veterinary stone management, recommends potassium citrate specifically for cats whose urine pH stays at 6.0 or below. Their typical starting dose is 75 mg/kg given twice daily, with the goal of reaching a urine pH near 6.5. If the pH stays below 6.0, the dose can be increased by 20% at a time. If a cat shows decreased appetite or blood potassium climbs too high, the dose gets reduced by 20%. This is something your vet needs to prescribe and monitor, not something to dose on your own.
Avoid Baking Soda and Home Remedies
You may come across suggestions to add baking soda (sodium bicarbonate) to your cat’s food or water to raise urine pH. This is genuinely dangerous. Baking soda is toxic to cats at relatively small amounts. Ingestion above 0.5 to 1.0 grams per kilogram of body weight can cause vomiting, diarrhea, muscle tremors, breathing difficulties, and seizures. For an average 10-pound cat, as little as half a teaspoon could be harmful.
Even using baking soda in the litter box carries risk, since many cats lick their paws after using the box and can ingest it that way. Repeated exposure through litter can also cause respiratory irritation. Stick with vet-recommended supplements and commercially formulated products rather than improvising with household items.
How to Monitor Urine pH at Home
Tracking your cat’s urine pH over time helps you know whether your dietary changes are working. The most reliable home option is a portable pH meter. Research comparing different home testing methods found that portable pH meters performed well as long as the electrode is properly maintained, while pH paper strips had poor accuracy and standard urine reagent strips were only moderately reliable. The reagent strips commonly sold in pet stores had a negative bias of about 0.12 pH units and only half of readings fell within 0.25 units of the true value. That margin of error matters when you’re trying to distinguish between a pH of 6.0 and 6.5.
To collect a sample, you can use non-absorbent litter beads (sold specifically for urine collection) or place a clean plastic liner under your cat’s regular litter. Urine stored in the refrigerator stays reliable for pH measurement for up to 24 hours, so you don’t need to rush to test the moment your cat uses the box.
Rule Out Underlying Health Conditions
Persistently acidic urine sometimes signals a deeper problem. Chronic kidney disease, diabetes, and adrenal gland disorders can all cause metabolic acidosis, a condition where the blood itself becomes too acidic, which then shows up in the urine. Cats with these conditions may have abnormal kidney values, electrolyte imbalances, or other symptoms like increased thirst, weight loss, or lethargy.
Stress can also play a role in urinary health, though its effect on pH specifically is less clear-cut. Cats with feline idiopathic cystitis, a stress-related bladder condition, showed significantly more blood in their urine during periods of moderate stress in controlled studies. Environmental enrichment, including larger spaces, hiding spots, toys, canned food, and regular human interaction, reduced clinical signs. While the connection between stress and pH isn’t as direct as diet, reducing environmental stress supports overall urinary tract health and is worth addressing alongside dietary changes.
If your cat’s urine pH remains stubbornly low despite dietary changes, or if you notice blood in the urine, straining to urinate, or frequent trips to the litter box, a full veterinary workup including blood chemistry and imaging can identify whether an underlying condition is driving the acidity.