Tap Water Quality Report
Tap water quality in JOSHUA, Texas
Tap water in JOSHUA, Texas receives a grade of D (68/100) from TapWaterSafety.org. It's served by JOHNSON COUNTY SUD. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Bromochloroacetic acid significantly above health guideline; Arsenic detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in JOSHUA's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving JOSHUA.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 21.8 ppb, 363x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 29.1 ppb, 194x above the EWG health guideline of 0.15 ppb.
Bromochloroacetic acid significantly above health guideline
Moderate concernBromochloroacetic acid detected at 3.84 ppb, 192x above the EWG health guideline of 0.02 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.13 ppb.
EPA compliance record
Official U.S. EPA records for JOHNSON COUNTY SUD (system ID TX1260018) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Inorganic Chemicals | Missed testing or reporting | 01/01/2021 | Resolved |
| Synthetic Organic Chemicals | Missed testing or reporting | 01/01/2021 | Resolved |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for JOSHUA
Filters matched to the specific contaminants in JOSHUA's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in JOSHUA's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
21.8 ppb | 0.06 | — | — | — | — | — | 363× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
29.1 ppb | 0.15 | 80.0 | 100 | — | — | — | 194× over |
| Bromochloroacetic acid Disinfection byproduct |
3.84 ppb | 0.02 | — | — | — | — | — | 192× over |
| Bromodichloromethane Disinfection byproduct |
6.78 ppb | 0.06 | — | — | — | — | — | 113× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
11.1 ppb | 0.1 | 60.0 | 60 | — | — | — | 111× over |
| Dibromoacetic acid Disinfection byproduct |
2.28 ppb | 0.03 | — | — | — | — | — | 76× over |
| Dibromochloromethane Disinfection byproduct |
6.17 ppb | 0.1 | — | — | — | — | — | 62× over |
| Arsenic Heavy metal |
0.13 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 33× over |
| Dichloroacetic acid Disinfection byproduct |
5.67 ppb | 0.2 | — | — | — | — | — | 28× over |
| Trichloroacetic acid Disinfection byproduct |
2.33 ppb | 0.1 | — | — | — | — | — | 23× over |
| Chloroform Disinfection byproduct |
6.31 ppb | 0.4 | — | — | — | — | — | 16× over |
| Bromoform Disinfection byproduct |
2.94 ppb | 0.5 | — | — | — | — | — | 5.9× over |
| Radium, combined (-226 and -228) Radiological |
0.15 pCi/L | 0.05 | 5.0 | — | — | — | — | 3.0× over |
| Nitrate Inorganic |
0.178 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.3× over |
| Nitrate and nitrite Inorganic |
0.169 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.2× over |
| Chromium (hexavalent) Heavy metal |
0.0218 ppb | 0.02 | — | — | — | — | — | 1.1× over |
| Chlorate Disinfection byproduct |
100.4 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Bromochloromethane Other |
0.0112 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
41.8 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Atrazine Pesticide/Herbicide |
0.00588 ppb | 0.1 | 3.0 | 0.1 | 100 | 0.15 | — | Below guideline |
| Molybdenum Other |
1.29 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
1.3 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.303 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.236 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.552 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Aluminum Heavy metal |
2.07 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
2.94 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
1.53 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
1.45 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Xylenes (total) Volatile organic compound |
2.08 ppb | 1800.0 | 10000.0 | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.717 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.298 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| 1-Butanol Other |
0.46 ppb | — | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
1.11 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Cyanide Inorganic |
4.88 ppb | — | 200.0 | 50 | 70 | 150 | — | Below guideline |
| Fluoride Inorganic |
0.961 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.183 ppb | — | — | — | — | — | — | Below guideline |
| Lithium Other |
25.2 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from JOHNSON COUNTY SUD.