TCEQ Drinking Water Viewer
Referenced source; no source-file checksum was available.
Open sourcePublished · structured public-water-system research
Atascocita water quality by PWS
Evidence stays scoped to the utility, district, public water system, measurement period, and source document recorded in the Stage A model.
Publication boundaryOnly accepted, published records selected by the Stage C route authority are rendered here.
Explicit uncertainty
What remains address-dependent
Twelve district PWS identities plus the Houston Main System service pocket, current PWS-scoped measurements, purchased-water relationships, and the postal/CDP boundary limitation are documented well enough for responsible market publication.
- Census state
- Partial
- Market model
- Resolved
- Address resolution
- Boundary Map
Who supplies water here?
13 documented public-water-system contexts
Each card remains independent. Measurements are not averaged across cards.
VerifiedHarris County MUD No. 151TX1010905 · District
- Utility
- Harris County MUD No. 151
- District context
- Harris County MUD No. 151
- Verification
- Verified
Purchased-water relationship
Harris County MUD No. 109 (TX1010620). Supplier identity is preserved as reported; this does not establish service at a specific address.
Verified measurements
| Parameter | Value | Statistic | Period | Source |
|---|---|---|---|---|
| chlorine residual | 1.9 ppm | average level | 2025 | Harris County MUD No. 151 2025 Annual Drinking Water Quality Report |
| lead | 0 ppb | 90th percentile | 2025 | Harris County MUD No. 151 2025 Annual Drinking Water Quality Report |
| copper | 0.16 ppm | 90th percentile | 2025 | Harris County MUD No. 151 2025 Annual Drinking Water Quality Report |
VerifiedHarris County MUD No. 152TX1010902 · District
- Utility
- Harris County MUD No. 152
- District context
- Harris County MUD No. 152
- Verification
- Verified
Verified measurements
| Parameter | Value | Statistic | Period | Source |
|---|---|---|---|---|
| chlorine residual | 1.95 ppm | average level | 2025 | Harris County MUD No. 152 2025 Annual Drinking Water Quality Report |
| lead | 0.753 ppb | 90th percentile | 2023 | Harris County MUD No. 152 2025 Annual Drinking Water Quality Report |
| copper | 0.14 ppm | 90th percentile | 2023 | Harris County MUD No. 152 2025 Annual Drinking Water Quality Report |
VerifiedHarris County MUD No. 46TX1010903 · District
- Utility
- Harris County MUD No. 46
- District context
- Harris County MUD No. 46
- Verification
- Verified
Verified measurements
| Parameter | Value | Statistic | Period | Source |
|---|---|---|---|---|
| free chlorine residual | 1.14 ppm | average level | 2025 | Harris County MUD No. 46 2025 Drinking Water Quality Report |
| lead | 0.5 ppb | 90th percentile | 2021-2023 | Harris County MUD No. 46 2025 Drinking Water Quality Report |
| copper | 0.211 ppm | 90th percentile | 2021-2023 | Harris County MUD No. 46 2025 Drinking Water Quality Report |
| total haloacetic acids (HAA5) | 1 ppb | highest locational running annual average | 2024 | Harris County MUD No. 46 2025 Drinking Water Quality Report |
| total trihalomethanes (TTHM) | 11 ppb | highest locational running annual average | 2024 | Harris County MUD No. 46 2025 Drinking Water Quality Report |
VerifiedHarris County MUD No. 106TX1013160 · District
- Utility
- Harris County MUD No. 106
- District context
- Harris County MUD No. 106
- Verification
- Verified
Purchased-water relationship
Trail of the Lakes MUD (TX1010617). Supplier identity is preserved as reported; this does not establish service at a specific address.
Verified measurements
| Parameter | Value | Statistic | Period | Source |
|---|---|---|---|---|
| free chlorine residual | 2.12 ppm | average level | 2024 | Harris County MUD No. 106 Water Quality Drinking Report |
| lead | 0.8 ppb | 90th percentile | 2022 | Harris County MUD No. 106 Water Quality Drinking Report |
| copper | 0.488 ppm | 90th percentile; one sampled site over action level | 2022 | Harris County MUD No. 106 Water Quality Drinking Report |
| total trihalomethanes (TTHM) | 4.1 ppb | highest locational running annual average | 2024 | Harris County MUD No. 106 Water Quality Drinking Report |
| arsenic | 2.3 ppb | highest level detected | 2024 | Harris County MUD No. 106 Water Quality Drinking Report |
VerifiedHarris County MUD No. 109TX1010620 · District
- Utility
- Harris County MUD No. 109
- District context
- Harris County MUD No. 109
- Verification
- Verified
Verified measurements
| Parameter | Value | Statistic | Period | Source |
|---|---|---|---|---|
| free chlorine residual | 1.84 mg/L | average level | 2025 | Harris County MUD No. 109 2025 Annual Drinking Water Quality Report |
| lead | 2.1 ppb | 90th percentile; one sampled site over action level | 2023-2025 | Harris County MUD No. 109 2025 Annual Drinking Water Quality Report |
| copper | 0.101 ppm | 90th percentile | 2023-2025 | Harris County MUD No. 109 2025 Annual Drinking Water Quality Report |
| total haloacetic acids (HAA5) | 0 ppb | highest locational running annual average | 2025 | Harris County MUD No. 109 2025 Annual Drinking Water Quality Report |
| total trihalomethanes (TTHM) | 0 ppb | highest locational running annual average | 2025 | Harris County MUD No. 109 2025 Annual Drinking Water Quality Report |
VerifiedHarris County MUD No. 132TX1010616 · District
- Utility
- Harris County MUD No. 132
- District context
- Harris County MUD No. 132
- Verification
- Verified
Verified measurements
| Parameter | Value | Statistic | Period | Source |
|---|---|---|---|---|
| chlorine residual | 1.93 ppm | average level | 2025 | Harris County MUD No. 132 2025 Drinking Water Quality Report |
| lead | 0 ppb | 90th percentile | 2023 | Harris County MUD No. 132 2025 Drinking Water Quality Report |
| copper | 0.0582 ppm | 90th percentile | 2023 | Harris County MUD No. 132 2025 Drinking Water Quality Report |
VerifiedHarris County MUD No. 153TX1012133 · District
- Utility
- Harris County MUD No. 153
- District context
- Harris County MUD No. 153
- Verification
- Verified
Verified measurements
| Parameter | Value | Statistic | Period | Source |
|---|---|---|---|---|
| free chlorine residual | 1.4 ppm | average level | 2025 | Harris County MUD No. 153 2025 Annual Drinking Water Quality Report |
| lead | 4.26 ppb | 90th percentile; one sampled site over action level | 2021-2023 | Harris County MUD No. 153 2025 Annual Drinking Water Quality Report |
| copper | 0.147 ppm | 90th percentile | 2021-2023 | Harris County MUD No. 153 2025 Annual Drinking Water Quality Report |
| total haloacetic acids (HAA5) | 0 ppb | highest locational running annual average | 2025 | Harris County MUD No. 153 2025 Annual Drinking Water Quality Report |
| total trihalomethanes (TTHM) | 0 ppb | highest locational running annual average | 2025 | Harris County MUD No. 153 2025 Annual Drinking Water Quality Report |
VerifiedHarris County MUD No. 278TX1012835 · District
- Utility
- Harris County MUD No. 278
- District context
- Harris County MUD No. 278
- Verification
- Verified
Purchased-water relationship
City of Houston Main System (TX1010013). Supplier identity is preserved as reported; this does not establish service at a specific address.
Verified measurements
| Parameter | Value | Statistic | Period | Source |
|---|---|---|---|---|
| chloramine residual | 2.89 ppm | highest average level detected | 2025 | Harris County MUD No. 278 2025 Drinking Water Quality Report |
| lead | 1.2 ppb | 90th percentile | 2025 | Harris County MUD No. 278 2025 Drinking Water Quality Report |
| copper | 0.0714 ppm | 90th percentile | 2025 | Harris County MUD No. 278 2025 Drinking Water Quality Report |
| total haloacetic acids (HAA5) | 19.3 ppb | highest level detected | 2025 | Harris County MUD No. 278 2025 Drinking Water Quality Report |
| total trihalomethanes (TTHM) | 13 ppb | highest level detected | 2025 | Harris County MUD No. 278 2025 Drinking Water Quality Report |
VerifiedHarris County MUD No. 290TX1013294 · District
- Utility
- Harris County MUD No. 290
- District context
- Harris County MUD No. 290
- Verification
- Verified
Purchased-water relationship
Harris County MUD No. 106 (TX1013160). Supplier identity is preserved as reported; this does not establish service at a specific address.
Verified measurements
| Parameter | Value | Statistic | Period | Source |
|---|---|---|---|---|
| free chlorine residual | 2.21 ppm | average level | 2025 | Harris County MUD No. 290 2025 Annual Drinking Water Quality Report |
| lead | 0 ppb | 90th percentile | 2022-2024 | Harris County MUD No. 290 2025 Annual Drinking Water Quality Report |
| copper | 0.0872 ppm | 90th percentile | 2022-2024 | Harris County MUD No. 290 2025 Annual Drinking Water Quality Report |
| total haloacetic acids (HAA5) | 0 ppb | highest locational running annual average | 2025 | Harris County MUD No. 290 2025 Annual Drinking Water Quality Report |
| total trihalomethanes (TTHM) | 2 ppb | highest locational running annual average | 2025 | Harris County MUD No. 290 2025 Annual Drinking Water Quality Report |
VerifiedHarris County MUD No. 412TX1013354 · District
- Utility
- Harris County MUD No. 412
- District context
- Harris County MUD No. 412
- Verification
- Verified
Purchased-water relationship
City of Houston Main System (TX1010013). Supplier identity is preserved as reported; this does not establish service at a specific address.
Verified measurements
| Parameter | Value | Statistic | Period | Source |
|---|---|---|---|---|
| chloramine residual | 3.08 ppm | highest average level detected | 2024 | Harris County MUD No. 412 2024 Drinking Water Quality Report |
| lead | 1.9 ppb | 90th percentile | 2022 | Harris County MUD No. 412 2024 Drinking Water Quality Report |
| copper | 0.0382 ppm | 90th percentile | 2022 | Harris County MUD No. 412 2024 Drinking Water Quality Report |
| total haloacetic acids (HAA5) | 8 ppb | highest level detected | 2024 | Harris County MUD No. 412 2024 Drinking Water Quality Report |
| total trihalomethanes (TTHM) | 11 ppb | highest level detected | 2024 | Harris County MUD No. 412 2024 Drinking Water Quality Report |
VerifiedHarris County MUD No. 494TX1013511 · District
- Utility
- Harris County MUD No. 494
- District context
- Harris County MUD No. 494
- Verification
- Verified
Purchased-water relationship
Harris County MUD No. 153 (TX1012133). Supplier identity is preserved as reported; this does not establish service at a specific address.
Verified measurements
| Parameter | Value | Statistic | Period | Source |
|---|---|---|---|---|
| lead | 0 ppb | 90th percentile | 2023-2025 | Harris County MUD No. 494 2025 Annual Drinking Water Report |
| free chlorine residual | 1.42 ppm | average level | 2025 | Harris County MUD No. 494 2025 Annual Drinking Water Report |
| copper | 0.0195 ppm | 90th percentile | 2023-2025 | Harris County MUD No. 494 2025 Annual Drinking Water Report |
| total haloacetic acids (HAA5) | 0 ppb | highest locational running annual average | 2025 | Harris County MUD No. 494 2025 Annual Drinking Water Report |
| total trihalomethanes (TTHM) | 0 ppb | highest locational running annual average | 2025 | Harris County MUD No. 494 2025 Annual Drinking Water Report |
VerifiedHarris County MUD No. 504TX1013522 · District
- Utility
- Harris County MUD No. 504
- District context
- Harris County MUD No. 504
- Verification
- Verified
Purchased-water relationship
Harris County MUD No. 412 (TX1013354). Supplier identity is preserved as reported; this does not establish service at a specific address.
City of Houston Main System (TX1010013). Supplier identity is preserved as reported; this does not establish service at a specific address.
Verified measurements
| Parameter | Value | Statistic | Period | Source |
|---|---|---|---|---|
| chlorine residual | 3.02 ppm | average level | 2024 | Harris County MUD No. 504 2024 Drinking Water Quality Report |
| lead | 1.3 ppb | 90th percentile | 2022 | Harris County MUD No. 504 2024 Drinking Water Quality Report |
| copper | 0.0173 ppm | 90th percentile | 2022 | Harris County MUD No. 504 2024 Drinking Water Quality Report |
| total haloacetic acids (HAA5) | 4.75 ppb | average level detected | 2024 | Harris County MUD No. 504 2024 Drinking Water Quality Report |
| total trihalomethanes (TTHM) | 5.08 ppb | average level detected | 2024 | Harris County MUD No. 504 2024 Drinking Water Quality Report |
VerifiedMain SystemTX1010013 · Municipal
- Utility
- Houston Public Works
- District context
- No separate district relationship recorded
- Verification
- Verified
Water source
90.3% surface water and 9.7% groundwater in the 2025 report.
Verified measurements
| Parameter | Value | Statistic | Period | Source |
|---|---|---|---|---|
| hardness as CaCO3 | 135.5 ppm | Main System average | 2025 | Houston Public Works 2025 Water Quality Report |
| total dissolved solids | 260 ppm | Main System average | 2025 | Houston Public Works 2025 Water Quality Report |
| pH | 7.8 standard units | Main System average | 2025 | Houston Public Works 2025 Water Quality Report |
| chloride | 38.4 ppm | Main System average | 2025 | Houston Public Works 2025 Water Quality Report |
Property-level next step
What should a homeowner test?
Stage A establishes system-level records, not the water condition at a faucet. Confirm the serving PWS first, then use the documented parameters below as comparison context for a property sample.
- free chlorine residual
- lead
- copper
- total haloacetic acids (HAA5)
- total trihalomethanes (TTHM)
- arsenic
- chlorine residual
- chloramine residual
- hardness as CaCO3
- total dissolved solids
- pH
- chloride
Visible provenance
Source documents supporting this market
TCEQ Water District Data
Referenced source; no source-file checksum was available.
Open sourceHarris County MUD No. 46 2025 Drinking Water Quality Report
Coverage: 2025. Referenced source; no source-file checksum was available.
Open sourceHarris County MUD No. 106 Water Quality Drinking Report
Coverage: 2024. Referenced source; no source-file checksum was available.
Open sourceHarris County MUD No. 109 2025 Annual Drinking Water Quality Report
Coverage: 2025. Referenced source; no source-file checksum was available.
Open sourceHarris County MUD No. 132 2025 Drinking Water Quality Report
Coverage: 2025. Referenced source; no source-file checksum was available.
Open sourceHarris County MUD No. 151 2025 Annual Drinking Water Quality Report
Coverage: 2025. Referenced source; no source-file checksum was available.
Open sourceHarris County MUD No. 152 2025 Annual Drinking Water Quality Report
Coverage: 2025. Referenced source; no source-file checksum was available.
Open sourceHarris County MUD No. 153 2025 Annual Drinking Water Quality Report
Coverage: 2025. Referenced source; no source-file checksum was available.
Open sourceHarris County MUD No. 278 2025 Drinking Water Quality Report
Coverage: 2025. Referenced source; no source-file checksum was available.
Open sourceHarris County MUD No. 290 2025 Annual Drinking Water Quality Report
Coverage: 2025. Referenced source; no source-file checksum was available.
Open sourceHarris County MUD No. 412 2024 Drinking Water Quality Report
Coverage: 2024. Referenced source; no source-file checksum was available.
Open sourceHarris County MUD No. 494 2025 Annual Drinking Water Report
Coverage: 2025. Referenced source; no source-file checksum was available.
Open sourceHarris County MUD No. 504 2024 Drinking Water Quality Report
Coverage: 2024. Referenced source; no source-file checksum was available.
Open sourceHarris County MUD No. 450 Water-Service FAQ
Referenced source; no source-file checksum was available.
Open sourceHouston Public Works 2025 Water Quality Report
Coverage: 2025. Referenced source; no source-file checksum was available.
Open source