Skip to content
TapBuff
ZIP

Harris County MUD 490

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
1,293 people
Connections
431
Water source
Surface water bought from another system
Based in
Houston, TX
County
Harris
Owner
Local government
The ZIP code it serves

77433

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) and nitrate: Texas’s own results, samples taken from July 27, 2022 to Sept. 9, 2026.

Below EPA’s limits2

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

10ppb

Highest yearly average, 2022 to 2026

Averaged by year, the highest was 10 ppb, in 2026, below EPA’s legal limit of 80 ppb. Its highest single sample was 16.3 ppb. That was also the latest year on file.

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

1.6ppb

Highest yearly average, 2022 to 2026

Averaged by year, the highest was 1.6 ppb, in 2026, below EPA’s legal limit of 60 ppb. Its highest single sample was 3.6 ppb. That was also the latest year on file.

What handles it

No certification claim covers this compound yet.

2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Lead
  • Nitrate

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) and nitrate results here are Texas’s own from 2022 on, with EPA’s national file for 2012 to 2019. Harris County MUD 490’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 July 27, 2022 to Sept. 9, 2026.

Testing your own tap

Harris County MUD 490’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 Harris County MUD 490 serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • R&C Joy, Inc.

    Katy, TX · about 7 miles

    Certified for bacteria

    (281) 858-5988

  • Eurofins EMLab P&K – Houston

    Houston, TX · about 11 miles

    Certified for bacteria

    (281) 940-2580

  • Water Utility Services, Inc.

    Spring, TX · about 18 miles

    Certified for bacteria

    (281) 290-0704

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 TX1013721. Rebuilt from EPA data on Oct. 18, 2026.

Also in Harris County

All Texas utilities

What to do next