Nitrate + Nitrite Trend Analysis

Spring	No. of Samples	Period	Mann- Kendall p-Statistic	Sen’s Slope (mg/L per year)	Mann-Kendall Trend
Alexander Springs	103	1977–2010	0.23372	-3.60E-04	stable
Apopka Spring	104	1986–2010	0.97412	-6.21E-03	stable
Blue Spring (Lake)	12	1996–2004	1.000	3.75E-02	stable
Blue Spring (Volusia)	82	1976–2010	3.64E-05	1.40E-02	increasing
Bugg Spring	54	1985–2010	1.02E-03	-1.57E-02	decreasing
Croaker Hole Spring	23	1995–2010	0.91697	-5.90E-04	stable
Double Run Spring	15	1998–2005	0.26551	-1.87E-01	stable
Fern Hammock Springs	92	1988–2010	1.99E-03	1.36E-03	increasing – insignificant
Gemini Springs	55	1995–2010	1.26E-05	4.38E-02	increasing
Green Springs	24	1996–2009	0.10741	2.46E-03	stable
Green Cove Spring	9	2001–2009	1.000	-2.60E-04	stable
Holiday Springs	10	1996–2004	0.80650	-4.67E-02	stable
Island Spring	6	2002–2009	1.000	-9.12E-03	stable
Juniper Springs	109	1984–2010	1.41E-04	1.06E-03	increasing – insignificant
Miami Springs	53	1993–2010	0.90165	-2.20E-04	stable
Orange Spring	11	2001–2009	0.53619	1.25E-03	stable
Palm Springs (Seminole)	53	1993–2010	0.65046	2.87E-03	stable
Ponce de Leon Springs	95	1984–2010	0.56834	3.62E-03	stable
Rock Springs	100	1984–2010	2.28E-03	-1.25E-02	decreasing
Salt Springs	97	1984–2010	0.53519	2.66E-04	stable
Sanlando Springs	53	1977–2010	0.36332	7.90E-03	stable
Silver Springs	59	1974–2010	2.47E-06	1.59E-02	increasing
Silver Glen Springs	92	1984–2010	0.35513	1.73E-04	stable
Starbuck Spring	54	1993–2010	0.53665	-6.42E-03	stable
Sweetwater Springs	75	1989–2010	0.16690	5.00E-04	stable
Wekiwa Springs	108	1977–2010	1.70E-04	-3.28E-02	decreasing