Copper in Texas well water
In Texas, 0% of 6,274 tested private well samples exceeded the EPA limit for copper (1.3 mg/L).
Copper leaches from pipes when water is acidic. Above 1.3 mg/L it causes stomach upset, and long-term exposure can harm the liver and kidneys. Blue-green stains on fixtures are the giveaway.
Check your copper number
Type the value from your lab report. It is compared to the EPA limit, the same way the full interpretation does it.
Getting it fixed
Book a free in-home water test with a licensed local company, or see the treatment guide for what removes copper.
By county, from individual samples
Public monitoring samples against the EPA limit (1.3 mg/L); counties with at least 30 samples.
| County | Samples | Detected | Above EPA limit | Median | Highest |
|---|---|---|---|---|---|
| Lamb | 32 | 91% | 0% | 0.003 | 0.041 mg/L |
| Reagan | 58 | 90% | 0% | 0.003 | 0.028 mg/L |
| Upton | 45 | 87% | 0% | 0.003 | 0.018 mg/L |
| Cass | 37 | 86% | 0% | 0.007 | 0.087 mg/L |
| Midland | 62 | 85% | 0% | 0.002 | 0.106 mg/L |
| Martin | 53 | 83% | 0% | 0.003 | 0.412 mg/L |
| Edwards | 50 | 80% | 0% | 0.002 | 0.04 mg/L |
| Gillespie | 56 | 79% | 0% | 0.004 | 0.026 mg/L |
| Starr | 34 | 76% | 0% | 0.004 | 0.035 mg/L |
| Lynn | 38 | 76% | 0% | 0.002 | 0.258 mg/L |
| Bexar | 76 | 75% | 0% | 0.002 | 0.04 mg/L |
| Burnet | 56 | 73% | 0% | 0.002 | 0.134 mg/L |
| Duval | 78 | 72% | 0% | 0.002 | 0.021 mg/L |
| Mason | 46 | 72% | 0% | 0.003 | 0.025 mg/L |
| Gaines | 38 | 71% | 0% | 0.002 | 0.018 mg/L |
- Big Lake CCD, Reagan County0% of 58
- San Antonio North CCD, Bexar County0% of 41
- Rankin CCD, Upton County0% of 38
- Tarzan-Lenorah CCD, Martin County0% of 44
- Midland South CCD, Midland County0% of 58
- Rocksprings South CCD, Edwards County0% of 36
- Hondo CCD, Medina County0% of 46
- Seminole CCD, Gaines County0% of 32
- Mason West CCD, Mason County0% of 33
- East Crockett CCD, Crockett County0% of 40
- New Braunfels CCD, Comal County0% of 32
- Johnson City CCD, Blanco County0% of 158
- Big Spring North CCD, Howard County0% of 34
- Southwest Travis CCD, Travis County0% of 30
- Dalhart CCD, Dallam County0% of 33
- Comanche CCD, Comanche County0% of 48
- Austin CCD, Travis County0% of 50
- Panhandle CCD, Carson County0% of 37
- Sonora Rural CCD, Sutton County0% of 110
- Kyle-Buda CCD, Hays County0% of 45
Sources
- Individual samples from the USGS Water Quality Portal and state monitoring, summarized per geography. copper counts and shares are listed on each county and town page with their sources.