What was found in Union's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Fluoride | 582.5 µg/L 15% of the EPA limit 4000 µg/L Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019 | 1/3 | SYR4 |
| Nitrate | 420 µg/L 4.2% of the EPA limit 10000 µg/L Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019 | 1/3 | SYR4 |
| Nitrate-Nitrite | 320 µg/L 3.2% of the EPA limit 10000 µg/L Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2012 | 1/3 | SYR4 |
| Copper | 260 µg/L 20% of the EPA limit 1300 µg/L Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019
Highest in the city: 264.6 µg/L — BROWNS CREEK W/D (SC4420002) · 2,790 people · 2018 | 3/3 | SYR4 |
| TTHM | 92.62 µg/L 116% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019
Highest in the city: 110.17 µg/L — MEANSVILLE RILEY W/D (SC4420001) · 7,368 people · 2019 | 3/3 | SYR4 |
| Bromoform | 27.994 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019
Highest in the city: 75.795 µg/L — MEANSVILLE RILEY W/D (SC4420001) · 7,368 people · 2019 | 3/3 | SYR4 |
| Chloroform | 44.7 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019
Highest in the city: 70.92 µg/L — MEANSVILLE RILEY W/D (SC4420001) · 7,368 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 32.03 µg/L 53% of the EPA limit 60 µg/L Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019
Highest in the city: 45.84 µg/L — MEANSVILLE RILEY W/D (SC4420001) · 7,368 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 33.991 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 25.3895 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019
Highest in the city: 31.7 µg/L — BROWNS CREEK W/D (SC4420002) · 2,790 people · 2019 | 3/3 | SYR4 |
| Lead | 30.85 µg/L 206% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 16.24 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019
Highest in the city: 22.87 µg/L — MEANSVILLE RILEY W/D (SC4420001) · 7,368 people · 2019 | 3/3 | SYR4 |
| Monobromoacetic Acid | 21.0095 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 11.26 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019
Highest in the city: 20.585 µg/L — MEANSVILLE RILEY W/D (SC4420001) · 7,368 people · 2019 | 3/3 | SYR4 |
| Dibromoacetic Acid | 11.29 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2019
Highest in the city: 20.133 µg/L — MEANSVILLE RILEY W/D (SC4420001) · 7,368 people · 2019 | 3/3 | SYR4 |
| Monochloroacetic Acid | 2.37 µg/L No EPA limit set Highest in the city: MEANSVILLE RILEY W/D (SC4420001) · 7,368 people · 2019 | 1/3 | SYR4 |
| Pfpea | 0.0119 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2024 | 2/3 | UCMR-5 |
| Pfhxa | 0.0082 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2024 | 2/3 | UCMR-5 |
| PFOS | 0.0061 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2024 | 2/3 | UCMR-5 |
| PFOA | 0.0059 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2024 | 2/3 | UCMR-5 |
| Pfhpa | 0.0036 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2024 | 2/3 | UCMR-5 |
| PFBS | 0.0030 µg/L No EPA limit set Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2024 | 1/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: UNION CITY OF (SC4410001) · 13,076 people · 2025 | 3/3 | 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.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Union
| Supplier | Population served |
|---|---|
| UNION CITY OF (SC4410001) | 13,076 |
| MEANSVILLE RILEY W/D (SC4420001) | 7,368 |
| BROWNS CREEK W/D (SC4420002) | 2,790 |
Frequently asked questions about Union tap water
Is Union tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Union. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Union?
3 public water suppliers report drinking-water monitoring for Union, South Carolina to the EPA. Each is listed above with its population served.
What contaminants are in Union's water?
The contaminants EPA monitoring detected in Union include Fluoride, Nitrate, Nitrate-Nitrite, Copper, TTHM. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.