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Tap water quality report

ZIP 77046 — Houston, TX

EPA monitoring across the 2 water suppliers serving ZIP 77046 in Houston, TX detected 42 contaminants. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier below, with the EPA limit for each.

2
water suppliers
2,976,528
people served
42
contaminants found

What was found in ZIP 77046

The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
780 µg/L 7.8%
of the EPA limit 10000 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Fluoride
538.0000000000001 µg/L 13%
of the EPA limit 4000 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Nitrate-Nitrite
310 µg/L 3.1%
of the EPA limit 10000 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 511 µg/L — FORT BEND COUNTY MUD 146 · 5,985 people · 2015
2/2 SYR4
Barium
365.3999999999997 µg/L 18%
of the EPA limit 2000 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Copper
338 µg/L 26%
of the EPA limit 1300 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Cyanide
93.49999999999997 µg/L 47%
of the EPA limit 200 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 147.99999999999997 µg/L — FORT BEND COUNTY MUD 146 · 5,985 people · 2019
2/2 SYR4
TTHM
49.635 µg/L 62%
of the EPA limit 80 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 52.175000000000004 µg/L — FORT BEND COUNTY MUD 146 · 5,985 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
49.96999999999999 µg/L 83%
of the EPA limit 60 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Chloroform
40.94999999999997 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Nitrite
36.49999999999999 µg/L 3.6%
of the EPA limit 1000 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
1/2 SYR4
Dichloroacetic Acid
36.38999999999997 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Lithium
33.9 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2025
2/2 UCMR-5
Chromium
14.110000000000001 µg/L 14%
of the EPA limit 100 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
1/2 SYR4
Bromodichloromethane
12.9 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Trichloroacetic Acid
12.329999999999997 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Combined Uranium
10.769999999999998 µg/L 36%
of the EPA limit 30 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Lead
10.74000000000001 µg/L 72%
of the EPA limit 15 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Gross Alpha, Excl. Radon And U
10.669999999999998 pCi/L 71%
of the EPA limit 15 pCi/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Selenium
10.56 µg/L 21%
of the EPA limit 50 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
1/2 SYR4
Monochloroacetic Acid
9.274999999999999 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Xylenes, Total
8.974999999999987 µg/L 0.1%
of the EPA limit 10000 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
1/2 SYR4
Bromoform
8.654999999999998 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Dibromochloromethane
5.2 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 8.089999999999996 µg/L — FORT BEND COUNTY MUD 146 · 5,985 people · 2019
2/2 SYR4
Gross Beta Particle Activity
7.2299999999999995 pCi/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Arsenic
7.0799999999999965 µg/L 71%
of the EPA limit 10 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
1/2 SYR4
Dibromoacetic Acid
3.4299999999999895 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 4.074999999999999 µg/L — FORT BEND COUNTY MUD 146 · 5,985 people · 2019
2/2 SYR4
Monobromoacetic Acid
3.9749999999999988 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
1/2 SYR4
Combined Radium (-226 And -228)
3.63 pCi/L 73%
of the EPA limit 5 pCi/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Ethylbenzene
2.075 µg/L 0.3%
of the EPA limit 700 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
1/2 SYR4
Di(2-ethylhexyl) Phthalate
1.5799999999999996 µg/L 26%
of the EPA limit 6 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
1/2 SYR4
Toluene
1 µg/L 0.1%
of the EPA limit 1000 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
1/2 SYR4
Dichloromethane
0.5000 µg/L 10%
of the EPA limit 5 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
1/2 SYR4
Atrazine
0.4650 µg/L 16%
of the EPA limit 3 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
Hexachlorocyclopentadiene
0.2150 µg/L 0.4%
of the EPA limit 50 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
1/2 SYR4
Simazine
0.2030 µg/L 5.1%
of the EPA limit 4 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
2/2 SYR4
6:2 Fts
0.0426 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2025
2/2 UCMR-5
Benzo(A)Pyrene
0.0400 µg/L 20%
of the EPA limit 0.2000 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
1/2 SYR4
Pfba
0.0106 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2025
2/2 UCMR-5
Endrin
0.0100 µg/L 0.5%
of the EPA limit 2 µg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
1/2 SYR4
Pfpea
0.0067 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2025
1/2 UCMR-5
Pfhxa
0.0051 µg/L
No EPA limit set
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2025
1/2 UCMR-5
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
Main supplier: CITY OF HOUSTON · 2,970,543 people · 2024
2/2 LCR
Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.

Water suppliers serving ZIP 77046

SupplierStatePopulation served
CITY OF HOUSTON TX 2,970,543
FORT BEND COUNTY MUD 146 TX 5,985

Frequently asked questions about ZIP 77046 tap water

Is the tap water in ZIP 77046 safe to drink?

EPA testing detected 42 contaminants across the water suppliers serving ZIP 77046. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.

Which water suppliers serve ZIP 77046?

2 public water suppliers report EPA drinking-water monitoring for ZIP 77046. Each is listed above with its population served.

What contaminants are in ZIP 77046's water?

EPA monitoring detected Nitrate, Fluoride, Nitrate-Nitrite, Barium, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.