Compliance record
Other contaminants detected
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 this
system's samples — over 100% is worth reading, but is not by itself a
violation. Where a single sample came in higher than that percentile, it
is noted under the bar. Formal violations are listed separately.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Trichloroethylene | 39 µg/L 780% of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 84 µg/L | 1338/3489 | SYR4 | 2012–2019 |
| Carbon Tetrachloride | 2.77 µg/L 55% of the EPA limit 5 µg/L
worst single sample: 4 µg/L | 467/2811 | SYR4 | 2012–2019 |
| 1,2-Dichloroethane | 2.1 µg/L 42% of the EPA limit 5 µg/L
worst single sample: 2.5 µg/L | 277/1524 | SYR4 | 2012–2019 |
| Nitrate | 7235 µg/L 72% of the EPA limit 10000 µg/L
worst single sample: 7800 µg/L | 154/164 | SYR4 | 2012–2019 |
| TTHM | 48 µg/L 60% of the EPA limit 80 µg/L
worst single sample: 55 µg/L | 134/168 | SYR4 | 2012–2019 |
| cis-1,2-Dichloroethylene | 4.39 µg/L 6.3% of the EPA limit 70 µg/L
worst single sample: 7.3 µg/L | 123/440 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 8.32 µg/L 166% of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 9.7 µg/L | 109/1169 | SYR4 | 2012–2019 |
| Bromoform | 8.9 µg/L No EPA limit set
worst single sample: 26 µg/L | 101/169 | SYR4 | 2012–2019 |
| Dibromochloromethane | 16.35 µg/L No EPA limit set
worst single sample: 20 µg/L | 74/169 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 4.715 µg/L No EPA limit set
worst single sample: 5.8 µg/L | 60/156 | SYR4 | 2012–2019 |
| Fluoride | 526 µg/L 13% of the EPA limit 4000 µg/L
worst single sample: 700 µg/L | 55/55 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 23.35 µg/L 39% of the EPA limit 60 µg/L
worst single sample: 25 µg/L | 54/156 | SYR4 | 2012–2019 |
| Bromodichloromethane | 15.65 µg/L No EPA limit set
worst single sample: 17 µg/L | 48/169 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 40/40 | LCR | 2025 |
| Chloroform | 17.4 µg/L No EPA limit set
worst single sample: 19 µg/L | 33/169 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 9.04 µg/L No EPA limit set
worst single sample: 10 µg/L | 30/156 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 4.96 µg/L No EPA limit set
worst single sample: 5.2 µg/L | 29/156 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 7.24 µg/L No EPA limit set
worst single sample: 7.4 µg/L | 24/156 | SYR4 | 2012–2019 |
| Barium | 130 µg/L 6.5% of the EPA limit 2000 µg/L | 18/21 | SYR4 | 2012–2018 |
| Combined Uranium | 11.6518 µg/L 39% of the EPA limit 30 µg/L
worst single sample: 12.069 µg/L | 15/15 | SYR4 | 2012–2018 |
| Nitrate-Nitrite | 385000 µg/L 3850% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 400000 µg/L | 11/11 | SYR4 | 2012–2018 |
| Monobromoacetic Acid | 3.72 µg/L No EPA limit set
worst single sample: 3.8 µg/L | 9/156 | SYR4 | 2012–2019 |
| Selenium | 7.56 µg/L 15% of the EPA limit 50 µg/L
worst single sample: 8.1 µg/L | 7/21 | SYR4 | 2012–2018 |
| Lithium | 45 µg/L No EPA limit set | 4/8 | UCMR-5 | 2024 |
| Lead | 8.23 µg/L 55% of the EPA limit 15 µg/L
worst single sample: 8.4 µg/L | 2/21 | SYR4 | 2012–2018 |
| Copper | 76 µg/L 5.8% of the EPA limit 1300 µg/L | 1/21 | SYR4 | 2012–2018 |
| Chromium | 2.5 µg/L 2.5% of the EPA limit 100 µg/L | 1/21 | SYR4 | 2012–2018 |
83 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl ChlorideXylenes, TotalO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
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Frequently asked questions about Gswc - Florence/Graham
Is Gswc - Florence/Graham tap water safe to drink?
EPA monitoring detected 27 contaminants in Gswc - Florence/Graham's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in Gswc - Florence/Graham's water?
EPA monitoring detected Trichloroethylene, Carbon Tetrachloride, 1,2-Dichloroethane, Nitrate, TTHM, and others. The full list with the level and data source for each is above.
How many people does Gswc - Florence/Graham serve?
Gswc - Florence/Graham reports serving 63,472 people in California, per its EPA record.
Has Gswc - Florence/Graham had any water quality violations?
The EPA has no formal drinking-water violations on file for Gswc - Florence/Graham.
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.