Shoal & Stem
Tap water lookup

South Riding, VA tap water

Supplied by Loudoun Water. Here's what its water means for your fish.

Disinfectant

Chloramine

Your water is treated with chloramine. Unlike chlorine, it doesn't gas off when water sits out, and many pitcher and fridge filters aren't rated to remove it. Conditioners that list chloramine on the label break it apart, which frees about 0.73 ppm of ammonia here. Some utilities switch to plain chlorine for a few weeks a year.

Safety for fish and shrimp

Ammonia (with conditioner)

Estimate

Up to 1.14 ppm (Worth knowing)

Typical 0.73 ppm

This is what a conditioner frees when it breaks the chloramine apart. A cycled filter clears it within a day; a big water change in a new or very small tank adds more of it at once. Some conditioners also bind ammonia for a day or so.

Estimated from the chloramine level Loudoun Water reports (2025).

Nitrite (NO₂)

Not detected (Low)

Not detected in testing, so any nitrite in your tank comes from the tank itself.

From EPA monitoring data (2014–2016).

Nitrate (NO₃)

3.8–5.2 ppm (Low)

Typical 4.5 ppm

Low, so water changes lower your tank's nitrate well.

Published by your utility: Loudoun Water's 2025 water quality report.

Copper at home taps (first draw)

Up to 0.28 ppm (Worth knowing)

The 90th percentile of first-draw samples from homes: water that sat in household pipes for at least six hours.

Shrimp and snails are sensitive to copper. Water that sits in household pipes picks up the most; it drops once the tap has run for a minute.

Published by your utility: Loudoun Water's 2025 water quality report.

Chlorine or chloramine at the tap

0–4.7 ppm

Typical 3 ppm

At tap levels, chlorine and chloramine are toxic to fish, shrimp and the bacteria in a filter. Water conditioners are made for this range.

Published by your utility: Loudoun Water's 2025 water quality report.

Water chemistry

General hardness

80–170 ppm

Typical 125 ppm

Moderately soft to medium. Suits most community fish and plants.

Published by your utility: Loudoun Water's website.

Carbonate hardness (alkalinity)

50–102 ppm

Typical 78 ppm

Moderate buffering. pH should stay fairly steady.

From EPA monitoring data (2012–2019).

pH

7–8.5

Typical 7.8

Most community fish do well here. Stable water matters more than the exact number.

Published by your utility: Loudoun Water's website.

  • Loudoun Water adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.

Who supplies South Riding, VA

Our data comes from public records and is still incomplete. Many utilities don't publish every number, so we're adding more all the time. Your city's range is a starting point: testing your own tap is the only way to know exactly what's in it.

Tap water lookup covers US cities only for now. Want to know why it matters? Read our story on tap water.

Compiled by Shoal & Stem from public records. Free to cite with a link.

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