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Fort Bend County MUD 115 Riverstone

What EPA’s and Texas’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.

Serves
1,527 people
Connections
1,673
Water source
Groundwater
Based in
Sugar Land, TX
County
Fort Bend
Owner
Local government
The ZIP code it serves

77459

The short answer

Nothing in EPA’s and Texas’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. No health-based violations on file since 2016.

What was found

Total trihalomethanes (TTHM), haloacetic acids (HAA5), nitrate, fluoride, arsenic, chromium (total) and uranium: Texas’s own results, samples taken from June 24, 2020 to July 29, 2026, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits4

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

54.8ppb

Highest yearly average, 2020 to 2026

2026 average: 25.6 ppb

Averaged by year, the highest was 54.8 ppb, in 2021, below EPA’s legal limit of 80 ppb. Its highest single sample was 55.5 ppb. In 2026, the latest year on file, its two samples averaged 25.6 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 54.5 ppb, in 2018.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

16.4ppb

Highest yearly average, 2020 to 2026

2026 average: 3.4 ppb

Averaged by year, the highest was 16.4 ppb, in 2022, below EPA’s legal limit of 60 ppb. Its highest single sample was 17.1 ppb. In 2026, the latest year on file, its two samples averaged 3.4 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 18.2 ppb, in 2016.

What handles it

No certification claim covers this compound yet.

Nitrate

Comes from the source

Below EPA’s limits

1.9ppm

Highest sample; found in 6 of 7

2026, one sample: 0.76 ppm

The highest sample, in 2023, was 1.9 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its one sample was 0.76 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 1.0 ppm, in 2017.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.19ppm

Highest yearly average, 2021 to 2024

Averaged by year, the highest was 0.19 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.34 ppm, in 2012.

What handles it

4 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)
  • Lead
  • Uranium

Violations since 2016

No health-based violations on file with EPA since 2016. There is 1 monitoring or reporting violation: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), nitrate, fluoride, arsenic, chromium (total) and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Fort Bend County MUD 115 Riverstone’s own annual report, which it must send you every year, has the contaminants this page does not show.

  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.

  • What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.

  • Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; Texas’s results run from June 24, 2020 to July 29, 2026.

Testing your own tap

Fort Bend County MUD 115 Riverstone’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab Texas certifies.

The 3 labs Texas certifies closest to the area Fort Bend County MUD 115 Riverstone serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Eurofins Xenco, LLC -Houston

    Stafford, TX · about 7 miles

    Certified for lead and copper

    (281) 240-4200

  • ALS Laboratory Group, Environmental Services Division – Houston, Texas

    Houston, TX · about 11 miles

    Certified for lead and copper

    (281) 530-5656

  • Envirodyne Laboratories, Inc.

    Houston, TX · about 11 miles

    Certified for bacteria, lead and copper

    (281) 568-7880

Texas Well Owner Network, Texas A&M AgriLife Extension: Well Informed screening events, where well owners bring in water samples to be screened for common contaminants, followed by an hour-long session explaining the results. Upcoming events are on the network's calendar. Trainings, Texas Well Owner Network.

All 80 certified labs for Texas

Sources

PWSID TX0790403. Rebuilt from EPA data on Oct. 18, 2026.

Also in Fort Bend County

All Texas utilities

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